Moving secondary usergroup to new primary usergroup

[Merriweather]

I want to move all members of secondary usergroup X to primary usergeroup A. However, prune/move users doesn't seem to have the option of searching by secondary usergroup. Is there another way?

Also, I would like to change all paid memberships to a new paid subscription I created. So I'd like all subscribers to X, Y or Z to now have a subscription to B with the same expiration that their old subscription had. Is there any way to do this?