My method isn't very detailed. I save thumbnails for each item with a matching name which makes it easy to sort. My CC collection is used as an archive to pull from so I don't have everything installed at once.
Modify - Mods
Defaults - Defaults
Creators - Multiple subfolders inside to organize by creator.
CAS - Miscellaneous bits from sites I only have one item from.
BuildBuy - Miscellaneous bits from sites I only have one item from.
If you're going to have levels of subfolders,
you will need to edit the Resource CFG file.