I want to split off a part of a Snippet but I never had dialog snippet to choose "split beat". How can i do ?
Split Beat is in the right-click menu or on Cmd/Ctrl-K. We no longer have dialog options, because the behavior we want is completely separate beats. This is done cosmetically in the current version you're using, and in 3.0 coming soon, it's formal. Every split beat becomes a completely separate beat, with no entanglements with the original beat.