When a discussion evolves, it might be possible that it will go in different directions and will branch into a number of topics that do in parallel, or will actually go into a topic that is more relevant to another forum altogether.
Forums administrators and facilitators can either take a thread of discussion in one point in the niddle and make it into a new discussion, or even move an entire discussion to another forum.
Note that it is not possible to move a specific answer from within a discussion to the middle of another discussion, because it might break the flow of the discussion.
If you see a discussion that need to be moved, please contact the community administrators.
For forum facilitators:
To branch a discussion at a specific point to make it a new discussion, use Actions > branch
It is at the bottom of the post: