Arbortext IsoDraw > User's Reference > Menus > Edit Menu > Duplicate
  
Duplicate
This command duplicates selected elements.
The Duplicate command on the Edit menu is a combination of the commands Copy and Paste > at same position with one exception: the selected elements are not saved to the clipboard. Consequently, they cannot be pasted into a drawing later using the Paste command.
This nevertheless has the advantage that the old contents of the clipboard are retained. The new elements are created on the active layer and lie at exactly the same position as the original elements.
If you are editing image elements, you can use this command to duplicate the selected pixels.