<https://www.creaweb2b.com/en/how-to-add-a-divi-section-or-module-inside-another-module/>

<https://divinotes.com/how-to-build-a-simple-plugin-to-easily-embed-divi-section-module-within-another/>

Add this to functions.php of the child theme.

// START Shortcode to show Divi Library Module
// Example shortcode [divi-library-item id="378"]
function divi_library_item_shortcode($moduleid) {
extract(shortcode_atts(array('id' =>'*'),$moduleid));
return do_shortcode('[et_pb_section
global_module="'.$id.'"][/et_pb_section]');
}
add_shortcode('divi-library-item', 'divi_library_item_shortcode');
// END Shortcode to show Divi Library Module
Code language: PHP (php)

Now you can add any module/row/section from the library anywhere you want with a shortcode liket this (the id is the postid from the library item).

[divi-library-item id="378"]
Code language: JSON / JSON with Comments (json)