Setting an offset on all captions without moving the whole clip

Hi, sorry if I'm not clear, I'm not fluent in English.

I'll try to be short : I set my caption at 01:00:11:14 from the beginning of my timeline (01:00:00:00)

But for some reason whent I export my CEA-601 subtitles as sidecar .SRT, all captions has an offset of 11 seconds and 14 frames. I tried to trim (not sure about tha word) but you can't trim the beginning of your clip. So i manualy set each timecodes of each captions with an offset of 11:14.

I wonder if there is a way to do that to all captions at the same time. It's quite time-consuming.

I checked in the .SRT file and each timecodes are set as if the clip was at the beginning of my timeline.

I would like not to do all this reset again.

Thank you for your time, i need help to save some of mine !