Hi Iming,

Create a new one2many field in your model and then add it to the view.
yourmodel.py:

//You could alternatively use the 8.0 API here too, then you'd use models.Model
 class your_class(osv.osv):
_inherit = res.partner
'all_partner_ids': fields.one2many(
            'res.partner', 'assigned_partner_ids',
            string='Customers',
        ),

yourview.xml:

<field name="all_partner_ids"/>