You can create a folder in one of the volume or create a qtree in that volume. Copy data mentioning source as volume and target upto newly create qtree. NDMP is the right choice.
While creating cifs share, mention path upto qtree.
assuming below mentioned scenerio in your case.
Vol1 and cifs share test1
Vol2 and cifs share test2
create qtree or folder in vol1 let say test2 then it would be /vol1/test2.
use ndmp copy as source vol2 and destination /vol1/test2.
create cifs share test2 and mention path up to /vol1/test.
Hope it will help.