I did this function to create delivery order for each order line when the locations is different in order lines

and create one deivery order when all order lines have the same location

but only one product appear in the delivery order when i select multi product with the same location

class SaleOrder(models.Model):
    _inherit = 'sale.order'

    @api.model
    def action_confirm(self):
        res = super(SaleOrder, self)

        locations = []
        for line in res.order_line:

            if line.location_ids not in locations:
                locations.append(line.location_ids)
                picking_vals = {
                    'origin':res.name,
                    'partner_id': res.partner_shipping_id.id,
                    'location_id': line.location_ids.id,
                    'location_dest_id': res.partner_shipping_id.property_stock_customer.id,
                     'picking_type_id': self.env.ref('stock.picking_type_out').id,
                     'sale_id': res.id,

                     'move_ids_without_package': [( {
                     'name': line.name,
                     'product_id': line.product_id.id,
                     'product_uom': line.product_template_id.uom_id.id,
                     'location_id': line.location_ids.id,
                     'location_dest_id': res.partner_shipping_id.property_stock_customer.id,
                     'product_uom_qty':line.product_uom_qty,
                     #'quantity_done': ,
                     #'forecast_availability':
                          })],
                }

                delivery_order=self.env['stock.picking'].create(picking_vals)
                delivery_order.state= 'assigned'
                #res.write({'state':'done'})
                res.write(res._prepare_confirmation_values())
        return res