1] Just create a copy of the project in File Explorer, rename the project and clean up.
2] Recreate the folder structure. For each folder you can select all the files in it in one go, you don't have to import file by file. Not sure if you realised that.
As you have found, you cannot import the folder structure.
See www.grainge.org for RoboHelp and Authoring tips
Great, thank you. I will submit an enhancement request to Adobe.
Thank you William.