first commit

__init__.py

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+from . import models

__manifest__.py

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+{
+    'name': 'Multi-Branch Employee Access',
+    'version': '1.0',
+    'category': 'Human Resources',
+    'summary': 'Allows employees to be associated with multiple branch companies',
+    'description': """
+        This module overrides the standard Odoo restriction of one company per employee.
+        It allows an employee to be associated with multiple branch companies.
+    """,
+    'author': 'Antigravity',
+    'depends': ['hr', 'pos_hr', 'hr_attendance'],
+    'data': [
+        'security/hr_security.xml',
+        'security/hr_attendance_security.xml',
+        'views/hr_employee_views.xml',
+    ],
+    'installable': True,
+    'application': False,
+    'license': 'LGPL-3',
+}

models/__init__.py

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+from . import hr_employee
+from . import pos_config

models/hr_employee.py

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+from odoo import models, fields, api, _
+
+class HrEmployee(models.Model):
+    _inherit = 'hr.employee'
+
+    company_ids = fields.Many2many(
+        'res.company', 
+        string='Branches',
+        domain="[('parent_id', '!=', False)]",
+        help="Branch companies this employee is associated with."
+    )
+    
+    # Overriding company_id to be computed from company_ids
+    # This maintains compatibility with standard Odoo logic that expects a single company_id
+    company_id = fields.Many2one(
+        'res.company', 
+        string='Company', 
+        compute='_compute_company_id', 
+        store=True, 
+        readonly=False,
+        required=True,
+        help="The primary company of the employee. Automatically set to the first branch in Branches."
+    )
+
+    attendance_manager_id = fields.Many2one(
+        'res.users',
+        domain="[('share', '=', False), ('company_ids', 'in', company_ids)]"
+    )
+
+    @api.depends('company_ids')
+    def _compute_company_id(self):
+        for employee in self:
+            if employee.company_ids:
+                employee.company_id = employee.company_ids[0]
+            elif not employee.company_id:
+                # Fallback to current company if none specified
+                employee.company_id = self.env.company

models/pos_config.py

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+from odoo import models, api
+from odoo.fields import Domain
+
+class PosConfig(models.Model):
+    _inherit = 'pos.config'
+
+    def _employee_domain(self, user_id):
+        # Override to check company_ids instead of company_id
+        # Standard pos_hr uses self._check_company_domain(self.company_id)
+        # which returns [('company_id', 'in', [self.company_id.id, False])]
+        
+        domain = [('company_ids', 'in', self.company_id.id)]
+        
+        if len(self.basic_employee_ids) > 0:
+            domain = Domain.AND([
+                domain,
+                ['|', ('user_id', '=', user_id), ('id', 'in', self.basic_employee_ids.ids + self.advanced_employee_ids.ids + self.minimal_employee_ids.ids)]
+            ])
+        return domain

security/hr_attendance_security.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <data noupdate="0">
+        <record id="hr_attendance.hr_attendance_rule_employee_company" model="ir.rule">
+            <field name="name">Attendance multi branch rule</field>
+            <field name="model_id" ref="hr_attendance.model_hr_attendance"/>
+            <field name="global" eval="True"/>
+            <field name="domain_force">['|', ('employee_id.company_ids', '=', False), ('employee_id.company_ids', 'in', company_ids)]</field>
+        </record>
+        
+        <record id="hr_attendance.hr_attendance_overtime_line_rule_employee_company" model="ir.rule">
+            <field name="name">Overtime Line multi branch rule</field>
+            <field name="model_id" ref="hr_attendance.model_hr_attendance_overtime_line"/>
+            <field name="global" eval="True"/>
+            <field name="domain_force">['|', ('employee_id.company_ids', '=', False), ('employee_id.company_ids', 'in', company_ids)]</field>
+        </record>
+    </data>
+</odoo>

security/hr_security.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <data noupdate="0">
+        <record id="hr.hr_employee_comp_rule" model="ir.rule">
+            <field name="name">Employee multi branch rule</field>
+            <field name="model_id" ref="hr.model_hr_employee"/>
+            <field name="global" eval="True"/>
+            <field name="domain_force">['|', ('company_ids', '=', False), ('company_ids', 'in', company_ids)]</field>
+        </record>
+    </data>
+</odoo>

views/hr_employee_views.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="view_employee_form_inherit_multi_company" model="ir.ui.view">
+        <field name="name">hr.employee.form.inherit.multi.company</field>
+        <field name="model">hr.employee</field>
+        <field name="inherit_id" ref="hr.view_employee_form"/>
+        <field name="arch" type="xml">
+            <!-- Replace company_id with company_ids -->
+            <xpath expr="//field[@name='company_id']" position="after">
+                <field name="company_ids" widget="many2many_tags" options="{'no_create': True}"/>
+            </xpath>
+            <xpath expr="//field[@name='company_id']" position="attributes">
+                <attribute name="invisible">1</attribute>
+            </xpath>
+        </field>
+    </record>
+</odoo>