I tried using extra variables but that didn't seem to work. I'm trying to create it like this leaderboard (https://www.speedrun.com/Stickman_Boost) but I can't seem to find out how to make it look like this.

Under extra variables/subcategories, you'll have to add a value first before ticking off "Use as subcategory" once you input a new variable, the value or values being the name of the subcategories you want