When you use any of these software to split a vob file, will you loose quality. I don't think so, but like to make sure.

bbTools 1.9 - good demuxer and mpeg2 analyzer
ChapterXtractor - extracts chapters from an ifo for MDVDP
ChopperXP 2.7 - VOB cutting utility with preview facilities. Website
DVD Shrink 3.0 beta 5 - extremely fast DVD transcoding utility. Website
DVDFab - Splitting, Stripping and Analyzing DVDs the easy way. Website
DoItFast4U 1.3.0 - re-authoring made easy. Website
DV Tool 0.24 - Swiss army knife for digital video <g>
FileMerger - a general filemerge tool
IfoEdit 0.96 - edit IFO files, create IFO files, stream processing for DVDs, DVD image and burning capabilities included. Website
IfoUpdate 0.77 - merges PGC/Cell structures between .ifo files
ImgTool Classic 0.91 - DVD image generator based on mkisofs. Website
ImgTool 1.00.6 - DVD burning program (requires Nero 5.5.8 or later installed).
jrdmux - bbTools optimized for speed
MakeItEasy 0.16 - allows you to keep menus and extras when using DVD2One
ReAuthorist 1.0.0 - putting DoItFast4U & DoCCE4U output together to a fully working Scenarist project ready for compilation. Website
VobEdit 0.6 - VOB editing utility, can split, demux, remux and join VOB files. Website
vobSplit 2.6 - used to split VOBs that can still be authored afterwards
Vobtools - various VOB related tools