I successfully ripped a VOS file from an old DVD video and added it to a new timeline. See discussion at Re: Adding New Material to Finished DVD
The VOS files work fine and I can add additional scenes to make a longer video. However, all the scenes within each VOS file are grouped together so I cannot make any revisions within the VOS scenes. Is there anyway to ungroup the scenes within each VOS file?
I think you mean VOB files, Jandr. There is no such thing as a VOS file.
But you are right, in any event. Your rendered VOB file on your DVD is a single file. It is not individual scenes. You can't edit a DVD and somehow get back to the original footage.
What version of Premiere Elements are you using and on what computer operating system is it running?
The video files from the DVD-VIDEO format (VTS_ files) present as a whole file made up of multiple scenes. Once the content of the first VOB, as an example, VTS_01_1.VOB, reaches 0.99 GB, new VTS (VTS_01_2.VOB etc) files will be generated each time the previous one reaches file size 0.99 GB.
You can trim each of these VOB files into scenes in the Premiere Elements Preview Window with its Set In and Set Out points.
you can right click the VOB thumbnail in Project Assets and select Run AutoAnalzyer. That should analyze the video and split it into scenes by content as best it can.
Please review and then let us know if any of that worked for you.