Hey there, @cmcbean - 

Welcome back to the Community!

Regrettably, there isn't a way to add shipping by category, it's only available via "per order" & "per item" when it comes to shipping rules. 

Shipping by category would be a Feature Request I can pass along to our Product Team to take a look-see. 

Thank you for posting and sharing what kind of additional features will help run your business.