I called Disney Visa twice yesterday with this same question (and again this morning after reading the previous posters response!

). I was assured that even if you have a balance on your card as well as the money you charged at Disney the other balance would be paid off BEFORE the no interest balance. I talked to 3 different people with the same question and got the same answer. We never carry a balance on our credit card so all other charges will be paid off monthly but we are going to be buying
DVC and want to charge the entire amount and get 0% for 6 months so we will not be able to pay off that amount next month! We are doing it this way so we can get the reward dollars too! I hope this helps!