We'll create fresh WordPress site with WooCommerce Checkout Field Manager installed. You have 20 minutes to test the plugin after that site we'll be deleted.
PPOM plugin is simply the best plugin to manage extra fields on Product page.
But to manage extra fields on Checkout N-Media developed another great plugin WooCommerce Checkout Field Manager. Simple and Fast
interface allow Admin to manage Checkout Page by adding extra fields or updating or removing existing fields in 13 areas.