User blog comment:Mmpratt99 deviantart/How Many Genre Categories Are You Permitted to Add?/@comment-7673575-20190906190147

To answer:

You can add as many categories as fit the story, as long as they aren't mutually exclusive.

Also, if you have your category, you can add your stories to it, but in order to have a category, you need to have at least 10 stories on wiki and ask an admin to create the category for you. If you fill these criteria, I can create your category right now if you wish.