how to add the subtitle in when my disc burn without it?

I am using corel dvd moviefactory 7>import digital media, after burning the movie from my hardisk folder to dvd. It came out without subtitles but my movie in the folder have subtitles. May I know how to add the subtitle to the burn copy when I re-burn. In a movie dvd what is the files for subtitles?

Thank you.

 

On K-lite codec pack have program DirectVobSub. When you burn dvd this program should be started.

 

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