Hi,

Link a specific service product (e.g., "10-Session Personal Training Package") to a contact (e.g., a personal trainer) in Odoo using a Many2one field.

Steps to Implement:

    1. Create the Service Product

        Go to Sales > Products.

        Click Create.

        Set:

            Name: 10-Session Personal Training Package

            Product Type: Service

            Add other details (price, invoice policy, etc.)

        Save the product.

    2. Add a Many2one Field to Contacts (res.partner)

        Use custom code or Odoo Studio.

        Field details:

            Name: training_package_id

            Type: Many2one

            Related Model: product.product

            Domain: [('type', '=', 'service')] - so only service products appear.

    3. Code Example (if using Python code)

class ResPartner(models.Model):

   _inherit = 'res.partner'

   training_package_id = fields.Many2one(

'product.product',

string='Assigned Training Package',

domain=[('type', '=', 'service')],

   )

   4. Use It in Contacts

   Go to Contacts > Open a Trainer's Profile.

   You’ll see the new dropdown field.

   Select the desired service product (e.g., the 10-session package).

   5. Result

    Each trainer/contact can be linked to one specific training service.

    Can be used for filtering, reporting, or invoicing logic later.

Hope it helps.