If you suggest a site to the wrong category, the editor will give the help you request, as a matter of course.
It's the other way around, really: you're trying to help the editor find the right category--if you can. If you can't find the right category, then you can't help, and the editor will have to do it himself. Which is what often happens.
Don't worry. If your suggestion is helpful, an editor won't mind finishing the part you couldn't do.