I want to automatically fill in the fields of the 'payment' model with the values from the fields 'customer_name', 'order_item' and 'order_price' in the 'orders' model.

Beginner. Please help

class payment(models.Model):
    _name='pickabite.payment'
    _rec_name='bill_id'
   
    #generating bill_id
    bill_id=fields.Char(string='Bill Id', readonly=True)
    @api.model
    def create(self, vals):
        x = self.env['ir.sequence'].next_by_code('pickabite.payment') or '/'
        vals['bill_id'] = x
        return super(payment,self).create(vals)
    

class orders(models.Model):
    _name='pickabite.orders'
    _rec_name='order_id'
    customer_name=fields.Many2one('pickabite.customer',
            string='Customer Name',required=True)
   

#generating order_id
    order_id = fields.Char(string='Order Id', Translate= True ,
            readonly = True)
    @api.model
    def create(self, vals):
        x = self.env['ir.sequence'].next_by_code('pickabite.orders') or '/'
        vals['order_id'] = x
        return super(orders, self).create(vals)

order_item=fields.One2many('pickabite.order_line','order_code',
            string='Order Item', ondelete='cascade')

order_price=fields.Float(compute='calc_order_price' ,string='Total')
    def calc_order_price(self):
         ..........