There are a few ways to move the topic, and no hard and fast rules about how to do it:
Method 1:
1) copy link to target forum to clipboard
2) post in thread to be moved "Hey, I'm moving it here: (paste link)
3) move thread (leaving closed thread in source forum.)
Method 2:
1)post note in thread to be moved "Hey, I'm moving it here: (blank space)
2) move thread (leaving closed thread in source forum)
3) Open target forum, and find the new thread there. Copy link to clipboard.
4) go back to source forum, and view closed thread.
5) re-open closed thread.
6) edit note "Hey, I'm moving it here: (paste link)"
7) re-close thread.
So it's possible, but it's also more intensive.
That's what I know- I certainly understand where you're coming from, from the convenience of not having to find the thread when you click through.