Here's how you can achieve delegation inheritance in Odoo to add extra fields to an existing model without altering its structure. This setup uses a Many2one relationship to link the extension to the original model, inheriting the fields seamlessly. The child model gets all fields of the parent, but the database table structure remains separate. class EmployeeExtension(models.Model): _name = 'employee.extension' _inherits = {'hr.employee': 'employee_id'} # Delegates to hr.employee employee_id = fields.Many2one('hr.employee', required=True, ondelete='cascade') extra_field = fields.Char(string='Extra Info')