Moving albums up one level

Followup to my question about splitting a large gallery. The large gallery (in album mode) is build like this (albums):

root (gallery1)
+---> GroupA
+---> GroupA-Album1
+---> GroupA-Album2
+---> ...
+---> GroupB
+---> GroupB-Album1
+---> GroupB-Album2

I've split the large gallery into 2, and have delete one part in each. So they look like this:

root (gallery2)
+---> GroupA
+---> GroupA-Album1
+---> GroupA-Album2
+---> ...

root (gallery3)
+---> GroupB
+---> GroupB-Album1
+---> GroupB-Album2

The top level albums (GroupA, and GroupB) are no longer needed. They were there to distinguis in the single large gallery.

Is there a way to move everyting below, say "GroupA" in gallery2 up to the root level, so that gallery2 looks like:

root (gallery2)
+---> GroupA-Album1
+---> GroupA-Album2
+---> ...

Option "Move to" seems to be available for images only.