First, the Vob file is part of a full DVD (extras, menus, etc).

What I want to do is add an audio track to the main title. Altogether, the main title will have a video track, one original audio track, one new, and one set of subtitles.

I multiplexed everything with IFOedit (side problem: the chapter points were off and the subtitles stop working after 2 chapters). But now how do I put the new VOB back with all the other DVD files?

When I put it all together and "get VTS sectors" there's an error, probably because the IFOs don't match up.

Is the only way to reinsert it to reauthor every little thing in all the files from scratch?

I'd like to just edit the old IFO to have a new audio track but I'm not sure how. I'm not an IFOedit expert.