How to synchronise metadata in functions.php

Dear Dev,

Is it possible to synchronise metadata (categories and locations) at Admin backend for a custom post type on EDIT/ADD pages in functions.php. I have tried some codes on github here:

https://github.com/polylang/polylang/blob/master/modules/sync/sync-metas.php

But none of them works for my website using a custom post type.

Can you please advise how to fix them?

I very appreciate your kind support.

Regards

Daro