anyone know how to make mod catoriges for melee weapons?

[sankojin]

I am trying to figure out a way to make multiple categories for melee weapons. Such as there is with guns right now. If you click on the barrel for example you go into the barrel mods. I would like to be able to do this with melee weapons. I have a basic understanding of how the guns work but I can not figure out how the melee weapons work. Anyone know of how to do this or know of a tutorial that shows this? I have tried making a template for each piece I want and then making a null version of each one. The problem that I am having is that it doesn't show up in the mods menu as different mod categories. It still only shows up as the standard one for all of them. Any help would be very much appreciated.