Advanced Custom Fields description field transfer to WordPress description field

You can export them using ACF and then import the XML using the WordPress import tool.

https://stackoverflow.com/questions/23505076/wordpress-advanced-custom-fields-exporting-and-importing-fields-to-a-new-wordp

You can import the ACF export using the ACF add-on for WPAllImport as well.

https://www.wpallimport.com/advanced-custom-fields/

I started to do this but I was fearing that all the advanced custom fields are in the XML file and I only want the one field for description.

Also when I import them won’t that create new posts?

I need them to import into the already created posts that contain all the other categories/field information etc.

Let me know if I’m wrong – and thanks for the response!

Personally, I would write the code myself to handle specific scenarios like the one you are talking about. You can do an update run using WPAllImport, so no it does not necessarily create a post unless you specify that you want this.