Hi, welcome to the forum!
You can do what you want by using Filters, which are basically sub folders of the Music node. Check out Filters on the wiki. (Link in my signature.) You can choose to have them displayed in left navigator or not.
Thanks for the response Psychoadept,
Filters aren't exactly what I'm looking for, but it's a usable workaround. I basically want to be able to make independent duplicates of the Music and Audiobook folders with different names. I don't want Stand up Comedy Albums in the Music Folder or Audiobook folder, it makes more sense to me to create a Navigation Node without filters (like Audiobooks) for comedy albums. At the same time I also have a bunch of looping Audio for Tabletop RPG that I do want to tag, but I'd never want to actually mix with my Main music folder.
I've gone through a good chunk of the documentation at this point and I'm not seeing any direct support for it, so it might be something that requires a plugin.