I've got Sonar 4 as well, and this is one of the many things I never figured out. It helped tighten my rhythm playing though - having to play it all as one take... :o

I should probably figure it out, but I can't be bothered reading the book... I'd like the answer too though!

After the split, can you highlight and copy the chunk in the timeline and then paste it afterwards? Just a thought. If I figure it out, I'll let you know...