I use Poser File Editor (which, oddly enough, I bough here) almost exclusively these days.  It is a great program, which doesn't ever make bad CR2s (which a lot of the more automated programs will, if you start doing non-normal stuff).

I used to use John Stalling's great program, but it can't handle the big CR2s we have these days.

I'll fill you in on what you have to do to remove a group properly if you ask me at Poser Pros.  ;-)