As far as I know the easiest way to do this would be to make a dupe of a main category and then make an individual subcategory for every main category and then edit every single run onto the newly created main categories. I would rather not do this as it would be pretty time consuming. I am talking about this board https://www.speedrun.com/shovelknight. The reason I would like to do this is so I could a have a subcategory with different variables depending on the main category.

Contact me on Discord about this. I'm in the site Discord.