As far as I can tell there seems to be no way to do this, but if there is, it’d save me lots of time!
(More than one scene in the same way you can shift+select multiple events, for example)
Not in GDevelop.
Can you make a copy of the game (via file explorer) and rename it?
If you have a ton of scenes to copy, you could change the project settings for both projects to save assets as multiple files, copy the scenes to the second project folder (via file explorer) and then hack the .JSONs to use the new scenes. This is just a thought - I haven’t done scenes, but I have done variables this way. Warning though - this route is a precarious and you’ll need to make a backup before commencing.
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