Virtuemart 2.6.x export selected orders

We need make export orders for VM 2.6.x on list of orders in administration. Admin check orders, which he want export and click on button EXPORT (new button in top right corder) Next he get exported orders in new blank popup window: delievery surname;delivery first name;delivery city;delivery address_1;;delievry address_2;delivery zip;;;delivery phone_1;email;order number;0.5;order total price;order number again;price for payment;delivery address - company;delivery country; We can have option to define 2 different fields order. Each next order on new row. All fields are just exported from database except "price for payment" About "price for payment": if payment is Cash on delivery - the fields is = total price (price ao all goods plus price for delivery plus payment fee) if payment is before on bank account - this fields = "0" We do like: if payment name have some phrase inside (like "cash") => price for payment = total price if not => price for payment is "0" We want this new codes in php file visibly bordered, because of future update of Virtuemart.