Need help making ped mods for GTA 5

[Assasinge]

Hi I'm having some trouble rigging peds for gta 5. I followed this tutorial here and I got all the way upto texturing. See my model only uses 3 textures for the whole mesh, but I have to rename the textures accordingly to each bodypart. Except I can't, unless I duplicate them or something I guess? Can anyone help?