What I have found to be the best thing to do is Produce each chapter which consists clips, transitions, titling, etc., as an MPEG file. When I have each one produced, I start a new workplace and drag and drop each of the mpegs into the timeline. I then add my opening clip and any ending clips (Titles, credits, etc). I added chapters at the beginning of each (mpeg) clip, and Create Disc. It works pretty nicely.
I hope everyone is enjoying their Christmas. Tomorrow I will worry about my burning to -R DVD's but today is Christmas with family and friends.