hi , you should use some vob editor tools help to do so, wondershare video editor is such an powerful tool can edit nearly all the commen video formats I have used. hope that is helpful.
I donn’t know which part do you want to edit of you .vob file.
Maybe you can use Boilsoft Video Converter to help you do that, it has a edit platform which you can select any part you like, and also allow you add subtitle to it.
Guide for you:
How to edit VOB video
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