Splitting Works No Problem and it works really well,
i never had that feature in classic so i do like it, its great for clearing up spam etc.
Its if you want to put stuff back into a thread.
it can land at the topic number you ask.
Or it can land at the date of the moving post.
I know we go on an on about them (bugs), but we have to mention them
to make the product a good all round product.
