Adding movie hashes / filesizes to subtitles

[error4o4]

Hi,
Sometimes I see that a subtitle matches another release too.
For example : https://www.opensubtitles.org/en/subtit ... potting-fr
This subtitle also matches with Trainspotting.1996.720p.BluRay.x264-CtrlHD.mkv (filesize 4637358632)
How do I add this info without modifying all other info for this subtitle ?

[error4o4]

I see that my question has been merged with an older thread, so I tried the method explained above : I used the "OpenSubtitles Uploader" software to upload the same subtitle file, with a different filename and filesize.
The app displayed messages showing that the new hash and filename were added. They were not shown right away on the web site, but they appeared the following day.
So, that answers my question. I was looking for an option to do the same thing directly in the web site, but the app works, so it's OK.