Python code:

class VmsVisitorsDetails(models.Model):
     _inherit = "res.partner"
     _name = "vms.visitors.details"

     name = fields.Char(required=True)



class VmsVisitorsSchedule(models.Model):
    _inherit = "res.partner"
    _name = "vms.visitor.schedule"

    name =fields.Many2one('vms.visitors.details',ondelete='cascade')

<field name = "name" placeholder="Name" />