Tmpg merging then demultiplexin issue, part2 not being seen

[darkskies]

for some reason when i merge part 1 with part 2 of a file then try to demultiplex it, it will only do part 1 and leave out part 2, or when I try to convert it to dvd ntsc it will only convert part 1 of the file and totally leave out part 2. So im thinking of just demultiplexing each file by themselves so i would have 2 m2v files and 2 mp2 files, my question how would i get dvd lab to author these files as one movie or at the end of part 1 go straight to part 2 without any delays in between

Thnx guys

[sanjayk]

Just author the files as part of same title set and DVD Lab will take care of the rest.