From https://analystcave.com/vba-the-vba-type/ “VBA does not allow you to create subfolders in your VBA Project”
The VBA addin Rubberduck http://rubberduckvba.com/ thankfully solves that issue using annotations. I.e. can add folders and subfolders by using a comment eg ‘@Folder(“Folder Name.SubFolder Name. etc”)
Ok back to reading the Types versus Classes as deciding which one is more appropriate, it’s tempting to push Types into classes.