I have seen that some speedrun pages have Versions listed, but have sub-categories for a range of versions (for example https://www.speedrun.com/mc). How do you set that up using the Variables for a game?

Two different variables. One is a regular variable that lists all the different versions of the game, the other contains ranges of versions and is set as sub-category.

Also, how do you make the Filters set to "Any" for default? Is there a way to do that?

If you look at https://www.speedrun.com/rogue_adventure#Classic_Mode_Any, I currently have to MANUALLY select Version->Any and Inferno Level->Any to see all runs.

Alright, figured out the second question. I had to remove the "Default" check from the variables that weren't sub-categories. ^_^

Thank you, Oreo, for your help! ^_^