Titles - can we add a subcategory? like HTM Candy: Hard Candy, or HTM Candy: Gummies Answered

I have a couple of different Instructables that I'd like to post, and they both fit the same title. Could I add a subtitle to the official required title to make it a more specific like this? How to Make Candy: Hard Candy How to Make Candy: Gummies I've seen some people do that, but don't know if that is what you are looking for.