Is there possible way how to ADD extra subs to DVD?

For example if you have DVD without subtitles and you grab it etc. Is there way how to add extra subtitles? If so can someone tell me how or link me somewhere

Use my guide on How to add subtitles to a DVD (using DVD-lab PRO). You can find it here ! I made also a MOVIE Tutorial, showing to people how to insert subtitles to a DVD.

Best regards.

Is there any other programs I can use for adding subtitles?