Welcome to the Disney Parks Moms Panel, Jaime! Thanks for your great question. I have had multiple active tickets at the same time in the past. In my experience and with a little bit of assistance from a friendly Cast Member, the process of prioritizing your tickets is simple.
When you arrive to any park at Walt Disney World Resort, head to the
Guest Relations Window at the park entrance. There, you will explain to the Cast Member that you have two sets of tickets and they'll be able to prioritize the order of use. You can do this on your first day only or every day if you want to change the tickets you plan to use. Just remember that any tickets and options added must be used within 14-days of first use.
Within that 14-day window, you may use your tickets on consecutive days or with breaks in between. It's up to you!
I hope this answers your question. Wishing you a fantastic vacation, Jaime. Please say hi to Mickey for me!
Andrea U.