assume you're asking if you can pay for the DDP when you have booked a % off the room rate Bounceback?
Yes, you can always pay for the DDP, but they generally require you to have a room & ticket package. (There's some sort of different rules for people with the annual passes & such...someone who knows about that will jump in here & tell.)
The only restriction is that you can't do the
Free Dining bounceback off and get a discount on the room rate (although for the first time this year they did allow SSR at 30% off with a Free Dining bounceback.)