Modify Files in Parent Theme

I’m actually using a child theme and need to modify a file from the parent theme. The thing is that this file is located in /themes/musicgreen/includes/custom-post-types/portfolio-type.php

I need to know how to modify it from the child theme and not the parent theme.

Tipically if the file is in the parent’s theme root folder i just place it under my child-theme’s root folder. But this is not the case.

Thanks in advance.