Is there a way to have two sortable lists - when I drag an item from list1, it produces a clonable to put in list2? 

Example:

  list1

     aa

     bb

     cc

  list2

     xx

     yy

     zz

dragging item 'bb' to list2 will remove it from list1. Instead, I'd like the contents of list1 to remain unchanged, and list2 to just get a clone of 'bb'.

Thanks