Custom order status act like COMPLETED order

Hi, I have custom order statuses in “Booster for Woocommerce” and I want to ask you, if I can set some of these custom statutes function as finished, same as native order status COMPLETED. Sometimes when customer buy gift coupon, this coupon is activated only when order is in status COMPLETED (order is closed). But I need the order in custom status (for example SENT AND PAID), but at the same time let the order act like in status COMPLETED.