Create a Subcategories

Hello,
I want to ask if it’s possible to add subcategory ? I found somethig like this:
https://squareup.com/help/us/en/article/6875-adding-items-and-categories-to-square-online-store

But in my app I don’t see anything like this.

Hey there. Currently subcategories are unique to the Square Online catalog and are used for organizing items for site display. We’re working to bring this functionality into the platform, extending it to all sellers (and developers!) even if they aren’t Square Online sellers.

Would you mind sharing why you’re interested in subcategories and how you might use them? Happy to set up a call to discuss.