Reply To: Billing user fields

Hello,

As you want to add and edit the billing fields in the checkout page. Currently our theme does not contain any option to add or edit those billing fields.

It requires customization and this is beyond our limitations and support policy.

You can read and follow the below article that might help you out:
https://docs.woocommerce.com/document/tutorial-customising-checkout-fields-using-actions-and-filters/

Best Regards.