Nope... if you don't order your dessert when you get your meal, you lose it. There is no way to "hold out" a portion of the meal credit. Maybe you can order something for dessert that you can carry around easily, like a cookie- then eat it later, when you are ready. That's what we plan on doing. We figure that saving desserts and eating them later will let us use most of our snack credits for H2O and other drinks (so we won't have to lug around water bottles we brought into the parks).