Duplicating a project?

I have a project I’m working on where I’d like to work up several variations based around the progression I’ve come up with. Is there any way to create duplicate versions, so I can make changes on one, but keep the original unchanged?

when you click the save button, it brings up a dialog box. If you change the displayed project name, (to something like “project1a”, it will create a file with that name and that will become the open project.