Custom List Form - Change Available Fields

Hello,

I have a currently built custom list form. I'm using a lot of javascript/jQuery to display certain fields based on an initial category dropdown. It works okay, but its getting clunky and hard to maintain because there's 20+ fields to manage.

I was wondering if there is an easier or more OOB way to adjust the fields the user fills out based on an initial category? Sort of like how when you select a different content type, the form fields change on the page options.

Thanks for any suggestions.

ex. quick example of what i'm doing

If the user selection category "A" from the first dropdown on the form, then fields 1, 2, 3 are shown. If they select B, then maybe fields 1, 3, 6, 7, 8 are shown, etc...