How to convert ISO file to 3D BDMV folder?

Hi friends, How does one go about converting ISO file to 3D BDMV folder? I want to burn 3D movie to 50gb Blu-ray disc after added subtitles. But with no luck. Because BDMV folder size very big. I will make ISO file to 3D BDMV folder but file size 71.9gb I can't write this size to blu-ray.

it's possible to extract but not to make an iso again. For the software that i know.

You don't need to go through ISO to add subtitles.

@Richard74 To avoid the "apparent" large increase in total size after adding subtitles, I believe you can use one of the functions of DVDFab to properly back up your 3D disc...