edit order - aberto para oferta

i need add 2 more points on edit order. 1 - the area "deliveries / payments" should have an option of sending "Envio por CTT registado [0,00€]", Should also be an option for Cobrança Postal [5,80€], This option can only appear in edit order (deliveries / payments), We do not intend that this payment option is on site, we could only assign this option in order to edit. 2- possibility that we can remove the assigned discounts, it is sometimes necessary when customers give up some parts and the order does not affect the value of the discount. As it is now, after the platform assign the discount, since we can not cut it ...