Step #17 in the I Heart Vanilla list
Featured In Mod Lists:
Expanded Vanilla (#130), I Heart Vanilla (#17), I Heart Vanilla: Director's Cut (#21), Graphics Overhaul (#202), Legacy Total Overhaul (#269), Total Overhaul (#274)
This tool is absolutely essential if you use a mod that deals with leveled lists, which is very common. If you don't know what that is, and you use more than a handful of mods with plugins, it is probably worthwhile to use this.
This link should have everything you need to know.