Combining modules after the fact.

So I am running LMoP for some folks and just purchased Rise of Tiamat. Is there a way to add RoT to my existing game or do I have to create a new game?

There are two ways to incorporate a new module into an existing game. 1: You can create a new game with the module and use the transmogrifier to move the components over to the existing game. Or 2: You can create a new game and use the character vault/ or transmogrifier to move characters over to the new game. Modules are designed to be used for new games and not added into existing games.

Thanks. That's kinda what I figured, but hoped for a better answer lol

Believe it or not but option two is the best bet due to the fact that if you get to many sheets and assets in a single game, it will start to bog down and lag.