Replicate objects in drag and drop

Hi all,
I am doing a lesson on electricity with my class. I have a range of electrical symbols which the kids use to create simple circuits by dragging and dropping on the interactive whiteboard. I only have one of each symbol displayed - when a student drags one away I want the symbol/object to replicate itself at the same point that one was dragged away from. In other words a kid can drag as many symbols/objects that he/she needs to complete a task.

Any help would be greatly appreciated.
Thanks, Bruce