Repository Hair? (Or master/slave, selective clone, etc!)

dingobear if you want to have different styles of textures in different packages and shown as in different slots in CAS. I would export all textures and thumb previews and then create a package via CAS ->Create Cas Standalone and then import back all textures on Studio tab (tutorial). When you create a recolor of custom mesh you need to put that mesh in Sims4Studio Mods folder wherever you have it on your disk, usually it's in My Documents/Sims4Studio/Mods, here is a tutorial how to do this. If you don't mind packing all existing textures in one package, then just import every swatch exported from another packages. Just make sure that this package contains mesh. The only thing I'm not sure about how to do is how to change swatch order.