I was in this situation a few weeks ago when I bought my AP. I decided to switch resorts to save even more $$ using the AP discount. My mom, who is going along, does not have an AP. My "package" was switched to basically a room-only and I ended up buying my mom her ticket elsewhere. When I asked if I could leave her ticket on the new "package", I was told that because AP users don't need tickets, and since I was booking an AP discount, there was no way to keep the ticket on the "package" for my mom. It ended up being quite a bit cheaper booking her ticket elsewhere.