Go to any Guest Relations BEFORE you head to a park and the CM will set the correct PRIORITY
on your tickets, so the correct one will be used first.
-OR-
If the tickets have never been used at all, you can create a "fake person" in your
MDX account and transfer any tickets that you DON'T want to use next to that "person's" account. (Since that "person" won't be entering a park, those tickets won't be used.)
Then, when you ARE ready to use those tickets, re-transfer those tickets back to the correct guests.