Sorry for the late response.
#1. I also installed this plugin: Custom User Registration Fields for WooCommerce
– Then add a custom NIP/EU-VAT field so you can customize in the user edit
– – Add this field to checkout form with custom code in functions.php file (child-theme)
https://prnt.sc/UpQ2z6Iep1yq
#2. I added this field to the order, please recheck: