diff --git a/event_sale_update_qty/README.rst b/event_sale_update_qty/README.rst
new file mode 100644
index 000000000..2f476b2d7
--- /dev/null
+++ b/event_sale_update_qty/README.rst
@@ -0,0 +1,103 @@
+=====================
+Event Sale Update Qty
+=====================
+
+.. 
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! This file is generated by oca-gen-addon-readme !!
+   !! changes will be overwritten.                   !!
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! source digest: sha256:36881c01853b670ba930e05e772258702f94e0a4f25ccceea8ce95094f1dbf2c
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+.. |badge1| image:: https://img.shields.io/badge/maturity-Beta-yellow.png
+    :target: https://odoo-community.org/page/development-status
+    :alt: Beta
+.. |badge2| image:: https://img.shields.io/badge/licence-AGPL--3-blue.png
+    :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+    :alt: License: AGPL-3
+.. |badge3| image:: https://img.shields.io/badge/github-OCA%2Fevent-lightgray.png?logo=github
+    :target: https://github.com/OCA/event/tree/17.0/event_sale_update_qty
+    :alt: OCA/event
+.. |badge4| image:: https://img.shields.io/badge/weblate-Translate%20me-F47D42.png
+    :target: https://translation.odoo-community.org/projects/event-17-0/event-17-0-event_sale_update_qty
+    :alt: Translate me on Weblate
+.. |badge5| image:: https://img.shields.io/badge/runboat-Try%20me-875A7B.png
+    :target: https://runboat.odoo-community.org/builds?repo=OCA/event&target_branch=17.0
+    :alt: Try me on Runboat
+
+|badge1| |badge2| |badge3| |badge4| |badge5|
+
+This module extends the functionality of *event_sale* to better manage
+event participants after the sale confirmation. Allow users to modify
+the number of attendees for event-related sale order lines after
+confirmation.
+
+**Table of contents**
+
+.. contents::
+   :local:
+
+Usage
+=====
+
+1. Create a quotation and add one or more products that correspond to
+   event tickets.
+2. Confirm the quotation.
+3. A button will now appear in the order lines that allows you to edit
+   the quantity.
+4. Click on the button for any line and edit the quantity to add or
+   remove records.
+5. Once the quantity has been edited, the event records associated with
+   the order will have been modified.
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/event/issues>`_.
+In case of trouble, please check there if your issue has already been reported.
+If you spotted it first, help us to smash it by providing a detailed and welcomed
+`feedback <https://github.com/OCA/event/issues/new?body=module:%20event_sale_update_qty%0Aversion:%2017.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.
+
+Do not contact contributors directly about support or help with technical issues.
+
+Credits
+=======
+
+Authors
+-------
+
+* Tecnativa
+
+Contributors
+------------
+
+-  `Tecnativa <https://www.tecnativa.com>`__:
+
+   -  Pedro Baeza
+   -  Pilar Vargas
+
+Maintainers
+-----------
+
+This module is maintained by the OCA.
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: https://odoo-community.org
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+.. |maintainer-pilarvargas-tecnativa| image:: https://github.com/pilarvargas-tecnativa.png?size=40px
+    :target: https://github.com/pilarvargas-tecnativa
+    :alt: pilarvargas-tecnativa
+
+Current `maintainer <https://odoo-community.org/page/maintainer-role>`__:
+
+|maintainer-pilarvargas-tecnativa| 
+
+This module is part of the `OCA/event <https://github.com/OCA/event/tree/17.0/event_sale_update_qty>`_ project on GitHub.
+
+You are welcome to contribute. To learn how please visit https://odoo-community.org/page/Contribute.
diff --git a/event_sale_update_qty/__init__.py b/event_sale_update_qty/__init__.py
new file mode 100644
index 000000000..aee8895e7
--- /dev/null
+++ b/event_sale_update_qty/__init__.py
@@ -0,0 +1,2 @@
+from . import models
+from . import wizards
diff --git a/event_sale_update_qty/__manifest__.py b/event_sale_update_qty/__manifest__.py
new file mode 100644
index 000000000..6d19fbc24
--- /dev/null
+++ b/event_sale_update_qty/__manifest__.py
@@ -0,0 +1,22 @@
+# Copyright 2025 Tecnativa - Pilar Vargas
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+{
+    "name": "Event Sale Update Qty",
+    "summary": "Update event registrations from confirmed sale order lines.",
+    "version": "17.0.1.0.0",
+    "development_status": "Beta",
+    "category": "Marketing",
+    "website": "https://github.com/OCA/event",
+    "author": "Tecnativa, Odoo Community Association (OCA)",
+    "maintainers": ["pilarvargas-tecnativa"],
+    "license": "AGPL-3",
+    "application": False,
+    "installable": True,
+    "depends": ["event_sale"],
+    "data": [
+        "security/ir.model.access.csv",
+        "views/sale_order_view.xml",
+        "wizards/event_sale_update_qty_wizard.xml",
+    ],
+}
diff --git a/event_sale_update_qty/i18n/es.po b/event_sale_update_qty/i18n/es.po
new file mode 100644
index 000000000..3741763c9
--- /dev/null
+++ b/event_sale_update_qty/i18n/es.po
@@ -0,0 +1,140 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* event_sale_update_qty
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 17.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2025-10-21 15:53+0000\n"
+"PO-Revision-Date: 2025-10-21 17:56+0200\n"
+"Last-Translator: \n"
+"Language-Team: \n"
+"Language: es\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"X-Generator: Poedit 3.4.2\n"
+
+#. module: event_sale_update_qty
+#: model_terms:ir.ui.view,arch_db:event_sale_update_qty.view_event_sale_update_qty_wizard_form
+msgid "<span colspan=\"2\" class=\"o_form_label\">Check those to remove</span>"
+msgstr "<span colspan=\"2\" class=\"o_form_label\">Marque los que desea eliminar</span>"
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__registration_ids
+#: model_terms:ir.ui.view,arch_db:event_sale_update_qty.view_event_sale_update_qty_wizard_form
+msgid "Attendees"
+msgstr "Asistentes"
+
+#. module: event_sale_update_qty
+#: model_terms:ir.ui.view,arch_db:event_sale_update_qty.view_event_sale_update_qty_wizard_form
+msgid "Cancel"
+msgstr "Cancelar"
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,help:event_sale_update_qty.field_event_sale_update_qty_wizard__event_id
+msgid ""
+"Choose an event and it will automatically create a registration for this "
+"event."
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,help:event_sale_update_qty.field_event_sale_update_qty_wizard__ticket_id
+msgid ""
+"Choose an event ticket and it will automatically create a registration for "
+"this event ticket."
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__create_uid
+msgid "Created by"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__create_date
+msgid "Created on"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__display_name
+msgid "Display Name"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model,name:event_sale_update_qty.model_registration_editor
+msgid "Edit Attendee Details on Sales Confirmation"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__event_id
+msgid "Event"
+msgstr "Evento"
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__id
+msgid "ID"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__write_uid
+msgid "Last Updated by"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__write_date
+msgid "Last Updated on"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model_terms:ir.ui.view,arch_db:event_sale_update_qty.view_order_form
+msgid "Modify attendees"
+msgstr "Modificar asistentes"
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__new_qty
+msgid "New Quantity"
+msgstr "Nueva cantidad"
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__sale_order_line_id
+msgid "Sale Order Line"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model,name:event_sale_update_qty.model_sale_order_line
+msgid "Sales Order Line"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__show_registrations
+msgid "Show Registrations"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__ticket_id
+msgid "Ticket"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model_terms:ir.ui.view,arch_db:event_sale_update_qty.view_event_sale_update_qty_wizard_form
+msgid "Update"
+msgstr "Actualizar"
+
+#. module: event_sale_update_qty
+#: model_terms:ir.ui.view,arch_db:event_sale_update_qty.view_event_sale_update_qty_wizard_form
+msgid "Update Attendee Quantity"
+msgstr "Actualizar cantidad de asistentes"
+
+#. module: event_sale_update_qty
+#: model:ir.model,name:event_sale_update_qty.model_event_sale_update_qty_wizard
+msgid "Wizard to update event attendees quantity from sale order line"
+msgstr ""
+
+#. module: event_sale_update_qty
+#. odoo-python
+#: code:addons/event_sale_update_qty/wizards/event_sale_update_qty_wizard.py:0
+#, python-format
+msgid "You must select exactly %s attendee(s) to cancel."
+msgstr "Debe seleccionar exactamente %s asistente(s) para cancelar."
diff --git a/event_sale_update_qty/i18n/event_sale_update_qty.pot b/event_sale_update_qty/i18n/event_sale_update_qty.pot
new file mode 100644
index 000000000..c16b7667b
--- /dev/null
+++ b/event_sale_update_qty/i18n/event_sale_update_qty.pot
@@ -0,0 +1,138 @@
+# Translation of Odoo Server.
+# This file contains the translation of the following modules:
+# 	* event_sale_update_qty
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Odoo Server 17.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2025-10-21 15:53+0000\n"
+"PO-Revision-Date: 2025-10-21 15:53+0000\n"
+"Last-Translator: \n"
+"Language-Team: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: \n"
+"Plural-Forms: \n"
+
+#. module: event_sale_update_qty
+#: model_terms:ir.ui.view,arch_db:event_sale_update_qty.view_event_sale_update_qty_wizard_form
+msgid "<span colspan=\"2\" class=\"o_form_label\">Check those to remove</span>"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__registration_ids
+#: model_terms:ir.ui.view,arch_db:event_sale_update_qty.view_event_sale_update_qty_wizard_form
+msgid "Attendees"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model_terms:ir.ui.view,arch_db:event_sale_update_qty.view_event_sale_update_qty_wizard_form
+msgid "Cancel"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,help:event_sale_update_qty.field_event_sale_update_qty_wizard__event_id
+msgid ""
+"Choose an event and it will automatically create a registration for this "
+"event."
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,help:event_sale_update_qty.field_event_sale_update_qty_wizard__ticket_id
+msgid ""
+"Choose an event ticket and it will automatically create a registration for "
+"this event ticket."
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__create_uid
+msgid "Created by"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__create_date
+msgid "Created on"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__display_name
+msgid "Display Name"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model,name:event_sale_update_qty.model_registration_editor
+msgid "Edit Attendee Details on Sales Confirmation"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__event_id
+msgid "Event"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__id
+msgid "ID"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__write_uid
+msgid "Last Updated by"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__write_date
+msgid "Last Updated on"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model_terms:ir.ui.view,arch_db:event_sale_update_qty.view_order_form
+msgid "Modify attendees"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__new_qty
+msgid "New Quantity"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__sale_order_line_id
+msgid "Sale Order Line"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model,name:event_sale_update_qty.model_sale_order_line
+msgid "Sales Order Line"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__show_registrations
+msgid "Show Registrations"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model.fields,field_description:event_sale_update_qty.field_event_sale_update_qty_wizard__ticket_id
+msgid "Ticket"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model_terms:ir.ui.view,arch_db:event_sale_update_qty.view_event_sale_update_qty_wizard_form
+msgid "Update"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model_terms:ir.ui.view,arch_db:event_sale_update_qty.view_event_sale_update_qty_wizard_form
+msgid "Update Attendee Quantity"
+msgstr ""
+
+#. module: event_sale_update_qty
+#: model:ir.model,name:event_sale_update_qty.model_event_sale_update_qty_wizard
+msgid "Wizard to update event attendees quantity from sale order line"
+msgstr ""
+
+#. module: event_sale_update_qty
+#. odoo-python
+#: code:addons/event_sale_update_qty/wizards/event_sale_update_qty_wizard.py:0
+#, python-format
+msgid "You must select exactly %s attendee(s) to cancel."
+msgstr ""
diff --git a/event_sale_update_qty/models/__init__.py b/event_sale_update_qty/models/__init__.py
new file mode 100644
index 000000000..8eb9d1d40
--- /dev/null
+++ b/event_sale_update_qty/models/__init__.py
@@ -0,0 +1 @@
+from . import sale_order_line
diff --git a/event_sale_update_qty/models/sale_order_line.py b/event_sale_update_qty/models/sale_order_line.py
new file mode 100644
index 000000000..c083b021f
--- /dev/null
+++ b/event_sale_update_qty/models/sale_order_line.py
@@ -0,0 +1,21 @@
+# Copyright 2025 Tecnativa - Pilar Vargas
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo import models
+
+
+class SaleOrderLine(models.Model):
+    _inherit = "sale.order.line"
+
+    def action_update_event_qty(self):
+        self.ensure_one()
+        return {
+            "type": "ir.actions.act_window",
+            "res_model": "event.sale.update.qty.wizard",
+            "view_mode": "form",
+            "target": "new",
+            "context": {
+                "default_sale_order_line_id": self.id,
+                "default_new_qty": self.product_uom_qty,
+            },
+        }
diff --git a/event_sale_update_qty/pyproject.toml b/event_sale_update_qty/pyproject.toml
new file mode 100644
index 000000000..4231d0ccc
--- /dev/null
+++ b/event_sale_update_qty/pyproject.toml
@@ -0,0 +1,3 @@
+[build-system]
+requires = ["whool"]
+build-backend = "whool.buildapi"
diff --git a/event_sale_update_qty/readme/CONTRIBUTORS.md b/event_sale_update_qty/readme/CONTRIBUTORS.md
new file mode 100644
index 000000000..b5e97353c
--- /dev/null
+++ b/event_sale_update_qty/readme/CONTRIBUTORS.md
@@ -0,0 +1,3 @@
+- [Tecnativa](https://www.tecnativa.com):
+  - Pedro Baeza
+  - Pilar Vargas
diff --git a/event_sale_update_qty/readme/DESCRIPTION.md b/event_sale_update_qty/readme/DESCRIPTION.md
new file mode 100644
index 000000000..23e21160e
--- /dev/null
+++ b/event_sale_update_qty/readme/DESCRIPTION.md
@@ -0,0 +1,4 @@
+This module extends the functionality of *event_sale* to better manage
+event participants after the sale confirmation.
+Allow users to modify the number of attendees for event-related sale order lines
+after confirmation.
diff --git a/event_sale_update_qty/readme/USAGE.md b/event_sale_update_qty/readme/USAGE.md
new file mode 100644
index 000000000..8aad95df3
--- /dev/null
+++ b/event_sale_update_qty/readme/USAGE.md
@@ -0,0 +1,6 @@
+1. Create a quotation and add one or more products that correspond to event tickets.
+2. Confirm the quotation.
+3. A button will now appear in the order lines that allows you to edit the quantity.
+4. Click on the button for any line and edit the quantity to add or remove records.
+5. Once the quantity has been edited, the event records associated with the order will
+   have been modified.
diff --git a/event_sale_update_qty/security/ir.model.access.csv b/event_sale_update_qty/security/ir.model.access.csv
new file mode 100644
index 000000000..a2e3f8764
--- /dev/null
+++ b/event_sale_update_qty/security/ir.model.access.csv
@@ -0,0 +1,2 @@
+id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
+event_sale_update_qty.access_event_sale_update_qty_wizard,access_event_sale_update_qty_wizard,event_sale_update_qty.model_event_sale_update_qty_wizard,base.group_user,1,1,1,1
diff --git a/event_sale_update_qty/static/description/icon.png b/event_sale_update_qty/static/description/icon.png
new file mode 100644
index 000000000..3a0328b51
Binary files /dev/null and b/event_sale_update_qty/static/description/icon.png differ
diff --git a/event_sale_update_qty/static/description/index.html b/event_sale_update_qty/static/description/index.html
new file mode 100644
index 000000000..35d36866e
--- /dev/null
+++ b/event_sale_update_qty/static/description/index.html
@@ -0,0 +1,447 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+<meta name="generator" content="Docutils: https://docutils.sourceforge.io/" />
+<title>Event Sale Update Qty</title>
+<style type="text/css">
+
+/*
+:Author: David Goodger (goodger@python.org)
+:Id: $Id: html4css1.css 9511 2024-01-13 09:50:07Z milde $
+:Copyright: This stylesheet has been placed in the public domain.
+
+Default cascading style sheet for the HTML output of Docutils.
+Despite the name, some widely supported CSS2 features are used.
+
+See https://docutils.sourceforge.io/docs/howto/html-stylesheets.html for how to
+customize this style sheet.
+*/
+
+/* used to remove borders from tables and images */
+.borderless, table.borderless td, table.borderless th {
+  border: 0 }
+
+table.borderless td, table.borderless th {
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+</head>
+<body>
+<div class="document" id="event-sale-update-qty">
+<h1 class="title">Event Sale Update Qty</h1>
+
+<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+!! This file is generated by oca-gen-addon-readme !!
+!! changes will be overwritten.                   !!
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+!! source digest: sha256:36881c01853b670ba930e05e772258702f94e0a4f25ccceea8ce95094f1dbf2c
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
+<p><a class="reference external image-reference" href="https://odoo-community.org/page/development-status"><img alt="Beta" src="https://img.shields.io/badge/maturity-Beta-yellow.png" /></a> <a class="reference external image-reference" href="http://www.gnu.org/licenses/agpl-3.0-standalone.html"><img alt="License: AGPL-3" src="https://img.shields.io/badge/licence-AGPL--3-blue.png" /></a> <a class="reference external image-reference" href="https://github.com/OCA/event/tree/17.0/event_sale_update_qty"><img alt="OCA/event" src="https://img.shields.io/badge/github-OCA%2Fevent-lightgray.png?logo=github" /></a> <a class="reference external image-reference" href="https://translation.odoo-community.org/projects/event-17-0/event-17-0-event_sale_update_qty"><img alt="Translate me on Weblate" src="https://img.shields.io/badge/weblate-Translate%20me-F47D42.png" /></a> <a class="reference external image-reference" href="https://runboat.odoo-community.org/builds?repo=OCA/event&amp;target_branch=17.0"><img alt="Try me on Runboat" src="https://img.shields.io/badge/runboat-Try%20me-875A7B.png" /></a></p>
+<p>This module extends the functionality of <em>event_sale</em> to better manage
+event participants after the sale confirmation. Allow users to modify
+the number of attendees for event-related sale order lines after
+confirmation.</p>
+<p><strong>Table of contents</strong></p>
+<div class="contents local topic" id="contents">
+<ul class="simple">
+<li><a class="reference internal" href="#usage" id="toc-entry-1">Usage</a></li>
+<li><a class="reference internal" href="#bug-tracker" id="toc-entry-2">Bug Tracker</a></li>
+<li><a class="reference internal" href="#credits" id="toc-entry-3">Credits</a><ul>
+<li><a class="reference internal" href="#authors" id="toc-entry-4">Authors</a></li>
+<li><a class="reference internal" href="#contributors" id="toc-entry-5">Contributors</a></li>
+<li><a class="reference internal" href="#maintainers" id="toc-entry-6">Maintainers</a></li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="section" id="usage">
+<h1><a class="toc-backref" href="#toc-entry-1">Usage</a></h1>
+<ol class="arabic simple">
+<li>Create a quotation and add one or more products that correspond to
+event tickets.</li>
+<li>Confirm the quotation.</li>
+<li>A button will now appear in the order lines that allows you to edit
+the quantity.</li>
+<li>Click on the button for any line and edit the quantity to add or
+remove records.</li>
+<li>Once the quantity has been edited, the event records associated with
+the order will have been modified.</li>
+</ol>
+</div>
+<div class="section" id="bug-tracker">
+<h1><a class="toc-backref" href="#toc-entry-2">Bug Tracker</a></h1>
+<p>Bugs are tracked on <a class="reference external" href="https://github.com/OCA/event/issues">GitHub Issues</a>.
+In case of trouble, please check there if your issue has already been reported.
+If you spotted it first, help us to smash it by providing a detailed and welcomed
+<a class="reference external" href="https://github.com/OCA/event/issues/new?body=module:%20event_sale_update_qty%0Aversion:%2017.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**">feedback</a>.</p>
+<p>Do not contact contributors directly about support or help with technical issues.</p>
+</div>
+<div class="section" id="credits">
+<h1><a class="toc-backref" href="#toc-entry-3">Credits</a></h1>
+<div class="section" id="authors">
+<h2><a class="toc-backref" href="#toc-entry-4">Authors</a></h2>
+<ul class="simple">
+<li>Tecnativa</li>
+</ul>
+</div>
+<div class="section" id="contributors">
+<h2><a class="toc-backref" href="#toc-entry-5">Contributors</a></h2>
+<ul class="simple">
+<li><a class="reference external" href="https://www.tecnativa.com">Tecnativa</a>:<ul>
+<li>Pedro Baeza</li>
+<li>Pilar Vargas</li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="section" id="maintainers">
+<h2><a class="toc-backref" href="#toc-entry-6">Maintainers</a></h2>
+<p>This module is maintained by the OCA.</p>
+<a class="reference external image-reference" href="https://odoo-community.org">
+<img alt="Odoo Community Association" src="https://odoo-community.org/logo.png" />
+</a>
+<p>OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.</p>
+<p>Current <a class="reference external" href="https://odoo-community.org/page/maintainer-role">maintainer</a>:</p>
+<p><a class="reference external image-reference" href="https://github.com/pilarvargas-tecnativa"><img alt="pilarvargas-tecnativa" src="https://github.com/pilarvargas-tecnativa.png?size=40px" /></a></p>
+<p>This module is part of the <a class="reference external" href="https://github.com/OCA/event/tree/17.0/event_sale_update_qty">OCA/event</a> project on GitHub.</p>
+<p>You are welcome to contribute. To learn how please visit <a class="reference external" href="https://odoo-community.org/page/Contribute">https://odoo-community.org/page/Contribute</a>.</p>
+</div>
+</div>
+</div>
+</body>
+</html>
diff --git a/event_sale_update_qty/views/sale_order_view.xml b/event_sale_update_qty/views/sale_order_view.xml
new file mode 100644
index 000000000..129ee4e3a
--- /dev/null
+++ b/event_sale_update_qty/views/sale_order_view.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!-- Copyright 2025 Tecnativa - Pilar Vargas
+     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->
+<odoo>
+    <record id="view_order_form" model="ir.ui.view">
+        <field name="model">sale.order</field>
+        <field name="inherit_id" ref="sale.view_order_form" />
+        <field name="arch" type="xml">
+            <xpath
+                expr="//field[@name='order_line']//tree/field[@name='product_uom_qty']"
+                position="after"
+            >
+                <button
+                    type="object"
+                    name="action_update_event_qty"
+                    icon="fa-edit"
+                    class="oe_inline"
+                    invisible="product_type != 'event' or state != 'sale'"
+                    title="Modify attendees"
+                />
+            </xpath>
+        </field>
+    </record>
+</odoo>
diff --git a/event_sale_update_qty/wizards/__init__.py b/event_sale_update_qty/wizards/__init__.py
new file mode 100644
index 000000000..fb0e102bf
--- /dev/null
+++ b/event_sale_update_qty/wizards/__init__.py
@@ -0,0 +1,2 @@
+from . import event_sale_update_qty_wizard
+from . import registration_editor
diff --git a/event_sale_update_qty/wizards/event_sale_update_qty_wizard.py b/event_sale_update_qty/wizards/event_sale_update_qty_wizard.py
new file mode 100644
index 000000000..c7c8960ea
--- /dev/null
+++ b/event_sale_update_qty/wizards/event_sale_update_qty_wizard.py
@@ -0,0 +1,71 @@
+# Copyright 2025 Tecnativa - Pilar Vargas
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo import _, api, fields, models
+from odoo.exceptions import UserError
+
+
+class EventSaleUpdateQtyWizard(models.TransientModel):
+    _name = "event.sale.update.qty.wizard"
+    _description = "Wizard to update event attendees quantity from sale order line"
+
+    sale_order_line_id = fields.Many2one("sale.order.line", string="Sale Order Line")
+    event_id = fields.Many2one(
+        related="sale_order_line_id.event_id",
+        string="Event",
+    )
+    ticket_id = fields.Many2one(
+        related="sale_order_line_id.event_ticket_id",
+        string="Ticket",
+    )
+    new_qty = fields.Float(
+        string="New Quantity",
+        required=True,
+    )
+    registration_ids = fields.Many2many(
+        "event.registration",
+        string="Attendees",
+        domain="[('sale_order_line_id', '=', sale_order_line_id)]",
+    )
+    show_registrations = fields.Boolean(
+        compute="_compute_show_registrations",
+        store=False,
+    )
+
+    @api.depends("new_qty")
+    def _compute_show_registrations(self):
+        for wizard in self:
+            wizard.show_registrations = (
+                wizard.new_qty < wizard.sale_order_line_id.product_uom_qty
+            )
+
+    def action_update(self):
+        self.ensure_one()
+        line = self.sale_order_line_id
+        if self.new_qty == line.product_uom_qty:
+            raise UserError(_("The quantity has not changed."))
+        if self.new_qty < line.product_uom_qty:
+            to_remove = self.registration_ids
+            if to_remove:
+                qty_to_remove = line.product_uom_qty - self.new_qty
+                if qty_to_remove != len(to_remove):
+                    raise UserError(
+                        _("You must select exactly %s attendee(s) to cancel.")
+                        % int(qty_to_remove)
+                    )
+                to_remove.unlink()
+                line.product_uom_qty = self.new_qty
+                return {"type": "ir.actions.client", "tag": "soft_reload"}
+        if self.new_qty > line.product_uom_qty:
+            line.product_uom_qty = self.new_qty
+            line._init_registrations()
+            result = self.env["ir.actions.act_window"]._for_xml_id(
+                "event_sale.action_sale_order_event_registration"
+            )
+            result["context"] = dict(
+                self.env.context,
+                default_sale_order_id=line.order_id.id,
+                default_sale_order_line_id=line.id,
+                event_sale_update_qty=True,
+            )
+            return result
diff --git a/event_sale_update_qty/wizards/event_sale_update_qty_wizard.xml b/event_sale_update_qty/wizards/event_sale_update_qty_wizard.xml
new file mode 100644
index 000000000..c8b9c0558
--- /dev/null
+++ b/event_sale_update_qty/wizards/event_sale_update_qty_wizard.xml
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!-- Copyright 2025 Tecnativa - Pilar Vargas
+     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->
+<odoo>
+    <record id="view_event_sale_update_qty_wizard_form" model="ir.ui.view">
+        <field name="name">event.sale.update.qty.wizard.form</field>
+        <field name="model">event.sale.update.qty.wizard</field>
+        <field name="arch" type="xml">
+            <form string="Update Attendee Quantity">
+                <group>
+                    <field name="sale_order_line_id" invisible="1" />
+                    <field name="show_registrations" invisible="1" />
+                    <field name="event_id" />
+                    <field name="ticket_id" />
+                </group>
+                <group>
+                    <group>
+                        <field name="new_qty" widget="integer" />
+                    </group>
+                </group>
+                <group invisible="not show_registrations" string="Attendees">
+                    <span colspan="2" class="o_form_label">Check those to remove</span>
+                    <field
+                        colspan="2"
+                        name="registration_ids"
+                        widget="many2many_checkboxes"
+                        nolabel="1"
+                    />
+                </group>
+                <footer>
+                    <button string="Cancel" class="btn-secondary" special="cancel" />
+                    <button
+                        string="Update"
+                        type="object"
+                        name="action_update"
+                        class="btn-primary"
+                    />
+                </footer>
+            </form>
+        </field>
+    </record>
+</odoo>
diff --git a/event_sale_update_qty/wizards/registration_editor.py b/event_sale_update_qty/wizards/registration_editor.py
new file mode 100644
index 000000000..d5a64a954
--- /dev/null
+++ b/event_sale_update_qty/wizards/registration_editor.py
@@ -0,0 +1,34 @@
+# Copyright 2025 Tecnativa - Pilar Vargas
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+
+from odoo import Command, api, models
+
+
+class RegistrationEditor(models.TransientModel):
+    _inherit = "registration.editor"
+
+    @api.model
+    def default_get(self, fields):
+        res = super().default_get(fields)
+        order_line_id = self.env.context.get("default_sale_order_line_id")
+        if not self.env.context.get("event_sale_update_qty") or not order_line_id:
+            return res
+        order_line = self.env["sale.order.line"].browse(order_line_id)
+        new_registrations = order_line.registration_ids.filtered(
+            lambda reg: reg.state == "draft"
+        )
+        res["event_registration_ids"] = [
+            Command.create(
+                {
+                    "event_id": reg.event_id.id,
+                    "event_ticket_id": reg.event_ticket_id.id,
+                    "registration_id": reg.id,
+                    "name": reg.name,
+                    "email": reg.email,
+                    "phone": reg.phone,
+                    "sale_order_line_id": order_line.id,
+                },
+            )
+            for reg in new_registrations
+        ]
+        return res