I am trying to transfer an hour long video from I-Movie to my Imac desktop, then drag into Toast DVD to then burn onto a dvd. For some reason, only 1/2 or 1/3 of my movie gets exported to my desktop. So I've had to put it into Toast DVD in 3 sections. Can I add chapters to each of these, and then make the three videos into one movie in Toast so I can burn them onto one dvd? Thanks.