Subscription help?

[Kyoshokid]

So when i set my forum up from the start i was unsure on how to setup subscriptions, now as my site has grown quite large i'm paying for it and need to fix it while i still can.

Basically i'm wondering if i move all the user's who are in one primary group to a new one, when there subscription runs out will it still move them back to what they were before they payed for a subscription?

I have x members in a current group that i need to move to a new group, when there time is up will they go back to whatever they were before?

Thanks