ElysiosMods

So, it's been awhile since I've used CK. I forget a lot. I understand still the way to create categories in CK for custom workbench (such as alchemy) So you would have the following if you were to be making a simple crafting workbench using keywords: Weapons 10mm .44 etc. but what I am wondering is if there is a way to double up categories so instead you would have Weapons Ballistic 10mm .44 Energy Laser Plasma So on, so forth. How can I accomplish this?