Format Rules/Multiple Categories
Sometimes you might want to have things organized a little more in depth than you can do with one category. For instance, you might have character profiles in a story and want to group them together, or you might want a separate category for each storyline of an interactive story based on the character that the reader chooses to play. This is fairly simple. All that you do is add another category. For instance:
[[Category:My Story|Page Name]] [[Category:My Story/Character Sheets|Page Name]]
Notice that in this example I have once again used the story name, but this time in the category field. That's because when we go to the Character Sheet category page we don't want an index of all the character sheets from every story, just the ones from your story.
Now to make the category
[[Category:My Story/Character Sheets]] a sub category, when we make the category page, instead of using the story type as the category, we use the Story Name.
Now, there are certain special cases that we want to see all the pages from every story in a category. One of these is Templates. If you make a template, it must contain the category
[[Category:Templates]]. This is not to say that you can't also add a subcategory for your story for it. e.g.:
[[Category:My Story|Page Name]] [[Category:My Story/Templates|Page Name]] [[Category:Templates]]
You can put as many categories on a page as you want. Categorizing the category (index) page assigns the parent category of that subcategory.