Pretty sure you can have duplicate listings. You can either "Move to" or Add to" If you select "Add to", it should copy the record from the folder its in, and add it to the new folder. I experimented with this once, i just found it easier to remove all the Sharks i had from the sets haha.
Sig by tha_penguin
After Joe Thornton serial #1's
Joe Thornton PC: (515) 11.36% Joe Thornton #'d 01/xx: (37) 1.34%
Owen Nolan (260) 15.63%
Couture (37) Demers (26) Sateri (23)
AFTER: TOMAS HERTL, HARRI SATERI