Merge subtitle of different languages

[Filippo]

Hello,
I have a Japanese subtitle and an English one for the same movie but they have different timecodes.
Japanese has 729 lines, english 720. However they have some differences because the japanese one has some sound description, while the english one has initial cast credits.

I need to set the timecodes of the english one to match the japanese, I know how to export timecodes and import them in Subtitle Edit, but I'd need the same number of lines. What is the best approach for this work?
I have translated the japanese .srt to english so I can roughly compare the two files, but once I remove the credit lines from the english one, I should remove the sound lines from the japanese, and then I'd need to adjust those manually. Or is there any other tool I could use?

Thanks

[davexnet]

Take a look at SubtitleEdit

[Filippo]

Take a look at SubtitleEdit

That's what I'm currently using.