I have a .srt file with the desired subtitles and I want to merge it into the main file. I want them as soft subs, though, and I haven't seen anything that says how to do this. All I can find is how to do them as hard subs.
Edit: Turns out that for me it's basically a moot point anyway, while the target machine supposedly plays .avi files I have not been able to get it to do so.