i tried to find info but without success, so im asking you guys.
1. if I have a 4 leg flight but only 2 vouchers, is it possible to choose which leg I want upgrade?
2. if I have a 4 leg flight and 4 vouchers, is it possible to upgrade only 2 (selected) legs out of 4 and to keep another 2 vouchers for another flights?
thank you