Thanks so much Shal,
I'm starting the process now.?
Exclude the files from this transfer, unless you want copies in the primary as well as the specific subgroup.
One clarification - when I moved a yahoo group several months ago to a subgroup here, I did not end up with files in both the main and the subgroup - only the subgroup. Something may have changed so I'll play it safe, but thought I would mention it.? I used the subgroup as the "to" group if that made a difference.
Fingers crossed
Beth