Combining Srt files into one for the purpose of authoring a DVD

[isobel]

Using the guide below which I found in this forum,

http://www.dvd-guides.com/content/view/231/59/

I ripped sub from a commercial DVD. The purpose was to translate it and put the translated sub into the original DVD.

Thing is that the guide above gave me 6 srt files because there are 6 .VOB files that the subs originated from.

And according to virtaully all DVD authoring guides I found here, I get the feeling that the sub file should be one, as opposed to six or whatever. Now the question is obviously 'How do I combine the six into one synchronised sub file?'. Or are there other ways to do this?

Thanks.