drjenkins, thanks for the tip, it helped me with other problems
JSWolf, I thought there might be an easier way to do it. Manually splitting book of 60+ chapters would take me forever.
And I have a new problem. For some, to me unknown, reason in the middle of one book it says "Chapter complete" even thou I'm at the beginning of it. XX h XX mins lef in book works. I uploaded that book if someone had time (and be kind) to check where the problem might be. The problems occurs in Part Two, Part One works fine.