Hello, I am recently a super moderator of a new game, Citampi Stories: Love Life RPG. And I wonder how to make sub categories, like Broke (without microtransactions) and Wealthy (with microtransactions)

To make sub-categories, you need to create a variable, assign the appropriate values to it (picking one as "default") and select the "Use as sub-category" option.

See the editing a leaderboard guide if you have further issues.