I have a single movie that is too long even for DL DVD. I want to know if I can split this movie within DVDA to create 2 DVD discs rather than re-rendering in Vegas to re-import into DVDA. Thanks!
Of course! You can trim it right on the DVD Architect timeline!
Just make one project that includes the first half of the video and another project that includes the second half. Ideally each disc should hold no more than 70 minutes of video.
More to the point, you didn't give the file size of your video. (Use file properties to give the number of bytes, not GB, to avoid confusion between giga 10^9 and gibi 2^30.)