Well, that's easy to do but not legal if you're going to use it in your movies or something like it .
Anyway here it goes . If you use adobe premiere and if not i think you can do the same with any other software .
Just copy the vob files into your computer if you cannot copy them then use shrink(free software) and after rename your vob files to mpeg and edit it with your editing software and trim the parts you want .