Provided your audio is stereo or mono, there is kind of an unusual but easy way to accomplish this. Use TMPGEnc DVD Author (TDA) to create a new DVD out of the original one. Since you have only one title, import it twice into separate tracks using Add DVD Video and Add New Track buttons. Trim each track to contain one of the two parts, and ensure that they have exactly the same length. Build a DVD without any menus. TDA creates a separate titleset for each track. Demux each titleset with VobEdit as follows: open VTS_01_1.VOB, click Demux, check Demux all Video streams and all Auduo streams. Repeat for VTS_02_1.VOB. You'll get two m2v files and two ac3/wav/mp2 files depending on your original audio format. Then you can import them into Scenarist and author a multi-angle DVD. Scenarist can import only elementary streams such as .m2v or .wav. It won't accept .mpg or .vob files. For NTSC DVD, it won't accept .mp2 audio either. Remember that video length should be precisely the same for both angles. Fortunately, TDA has counters that show the length of the trimmed clip. If you positively can't make them the same length, add the shorter one as a first angle on your track, and Scenarist will cut off the end of the longer clip. Don't forget to set the scene angle type to non-seamless before adding the audio for each angle.