Some Share options allow you to output only a portion of your project.
Unfortunately, you can't do this with a DVD. You always get the entire timeline.
However, an easy solution would be to Share to your Personal Computer as a DV-AVI. Open a new project, place your AVI on the timeline and trim it so that only the portion you want to included is on the timeline -- and then burn your DVD from that.
Steve, thanks for the advise. Now I'll work my way around the problem.