Most people who mod TS4 have run into the nested folder problem: TS4 limits nested mod folders to two levels, which greatly reduces the ability to sort CC in various categories and sub-categories. This tutorial will show you how to increase the depth of your nested mod folders. It should take less than five minutes using Notepad (or any other simple file editing equivalent) in Windows, and Mac users should presumably be able to use this same method.

Go to your mods folder.

In this folder, there is a file called resources.cfg. This file basically tells the game 'here are the mods and here's how deeply into nested folders you should look for them'. Go ahead and open it in Notepad.

You'll see something like this: