Is there any way to add rules to sub categories? In the game I moderate (Phasmophobia), we have different categories for Solo to Quartet and then sub categories for Any% and 100%. I want to make rules for Any% and 100% and have them show up as "Category rules" because right now I can only make rules for Solo to Quartet. Is there any way to do this without changes the way the entire variable system works (as Any% and 100% are variables while Solo to Quartet are categories).

Yes you can. Go to your subcategory variable in "edit game -> variables", then click on the dots near any value of that variable -> edit value. You can write rules for that specific value of the subcategory.

Note that the main category rules will show first, and then the subcategory rules. You can't change that order.

You can add Rules for every sub category/variable. Just click on "edit value" and you can add rules for just this value.