You could ndmpcopy the data up a level out of the qtree or copy it out if you want the same structure.
It is better move than copy. Copy will require double amount of space, and move is quite cheap and fast (as long as number of top level directory entries is reasonable).
I understand the concept of what you are saying, but I was unaware of a command to move data between volumes and Qtrees. Aside from volcopy, ndmpcopy, snapmirror (VSM and QSM). What command would you use to perform this move?