Well if you still have both input files CD1.avi and CD2.avi why don't you reconvert the whole thing and use the MERGING option.
Take both CD and make 1 title with it.
All explained in the manual how to do this.
If all you have is the VIDEO_TS output, load the VIDEO_TS.IFO and try to merge your 2nd part with it.
If you can't merge, worst case, create 2 titles, and enable [X] Play videos one after na other.
Part 2 will auto start to play after part 1 is done, with maybe a small 1 sec stop between them.
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