Tiffiney,
I suspect the answer is no - I had a quick look at a couple of options? but no go. Any particular reason you didn't want to set up a subgroup? Slightly awkward I admit, as you'd have to invite members (assuming you make it a restricted group not listed in the parent)...
Edit - the invite process would only be needed if you're using a basic rather than premium group.
Derek
Derek Milliner