Board Thread:Support Requests - Getting Technical/@comment-32151199-20170628113433/@comment-168424-20170628230726

Whether a category is a subcategory of another is not determined by the pages in the category.

If you have an "Appearances" category and want a "Final tests" category as a subcategory of the category, you need to go to Category:Final tests page and add the Appearances category to it.

However, if you want to add a page with a template that has a parameter passed like  to a category based on the name, you would use something like   and that page would appear in Category:Somename-related pages.