fast pass plus and will call ticket

[RoadTrip72]

I currently have 3 (3 day) tickets at will call. I do not want to use all of them on my upcoming trip. Is there a way for me to access only 2 of them to set up my fast passes for my upcoming trip or should I just wait until I get to the park so I don't accidently activate all 3? Here is our game plan. DD and I are flying down and spending 2 days in the parks. DH is flying down and is spending one day with us at the Magic Kingdom. (We are spending the rest of the trip at non-Disney facilities. ) I plan on buying him a one day ticket instead of using my extra 3 day ticket. I plan to use it for a girls only trip later next year. Any tips or hints are greatly appreciated in how to do this!