I am planning a trip for my two kids and I for 11/22-11/25. We have AP's and I normally book room only because we only stay a night at a time. For this trip I'd like to do a Room and Dining plan. I know I can book that through the passholder site but is it possible to book the rooms now using a discount and then call back and add the DDP? And if I decide to wait and just book the room and DDP at once can I get a discount on the room if one is available?