Sub category of a Category

What I mean is to be able to have a couple of categories, such as Beverages to be available in other categories for streamlining and faster entries, or a category of Fryer foods the might be ordered with a sandwich such as French Fries or Onion rings ...etc. If a customer orders a hamburger with french fries and a soda, that's a lot of hopping around for that one seat. I know a way to do it but then I would have 10 different french fry entries all labeled different.