Like Sam said you can have as many different folders as you want & switch them in & out whenever you like, right now I have 16 different pose folders I can swap between while poser is running & I haven't lost a single one yet. Taking Sam's folders as an example, if he's using PoseDefault at the time he's using it it's called pose, when he switches over to pose V3 that will be renamed to pose & the other will be renamed to PoseDefault. I've had PBooost since August last year & it's really one of the best purchases I've made since I started using poser.