Rooms control would have to make the switch after you have your confirmed reservation. YOu can't book the 2BR lock off since you own a 3BR unit that locks off in to a 2BR master and a studio unit. These units are a little unique in how they are setup. The 2BR isn't your standard 2BR dedicated unit. The resort can make a switch, though it is all based on if they have a unit available to switch you to. Given that it is a large resort, with a lot of exchangers, I would think it shouldn't be a problem. But you really need to discuss it with rooms control. Owner Services can't reserve a 2BR lock off and a studio for you from your 3BR unit.