Allow mods to break out topics/nest topics

I was just in the learning and discussion looking at the NIZ sliders topic and realized part way through that the topic shifted to Topre stab mods which is another useful topic however it kind of gets lost in another thread.

I think that there should be a way for mods to split topics in their own threads, perhaps add a special button or bar with “related topics” for easy navigation between the new and old topics as they must, in some way, be related.