I have already made a room only reservation for ASMovies in December. I did this through the Disney website on my own. I have read things about changing reservations when discounts come out and applying these discounts to reservations that are already made. Is this only when you book through a travel agent, or if I find a code on my own, can I call Disney myself and have them apply it to my existing reservation? or will I have to get a new reservation? Sorry if this is confusing! Thanks for any help.