Mention Filtering (layer multiple mentions)

I feel like there should be a way to layer multiple mentions to mention more specific groups. For example, in a school server, you could @Calculus & @Honors so if you had a question about the honors calculus homework, you could ask only honors calculus people, but if you have a question about calculus in general, you could just @Calculus and have everyone help without having to make a bunch of separate special roles.