I looked into creating a copy of a lesson. It appears that at the moment, it's only possible to create a copy of local whiteboard/notebook files (you can press the Share icon on the left hand navigation bar while the file is open in the Whiteboard app, then press "Save a Copy" to make a copy of the file. BUT for Lumio lessons, there currently does not appear to be a way to save a copy of an existing lesson within iQ. A workaround would be to login to Lumio on the iQ browser and create a copy there.