Okay, the default DS-format content folder is “...Documents\DAZ 3D\Studio\My Library”. The path up to “My Library” is the base for that content folder. Underneath “My Library” are 3 special folders: Data, Runtime, and ReadMe’s. Those 3 folders have to be directly under the base folder, and you cannot put DS-format content in those folders (except under Runtime with a matching Poser-format file)—if you do, they won’t show up. Any other folder underneath “My Library” can hold DS-format content, and it can have any name you like.
For example, let’s say I don’t like the folder names “Environment” and “Architecture” that are typically used for those kinds of objects. I decide I want to call it “Places”. I can make a folder under “My Library” called “Places”, and under that I can have subfolders called “Interiors”, “Exteriors”, etc. Or maybe I’d rather have subfolders called “Stonemason”, “Faveral”, “ARTCollab”. I can name them anything I like.
Or let’s say I don’t like putting Clothing under “People”. I can make a folder called “Clothing” instead. Or “V4 Clothing”.