I use the WooCommerce Bookings plugin and WooCommerce TM Extra Product Options to have additional options on my products.
The second extension displays the additional fields in front-end but not in the back-end when I want to create a reservation manually.
In front-end I can display additional fields with the following hook:
The thing is complicated in back-end because no hook is present, the form is immediately implemented.
File : woocommerce-bookingsincludesadminviewshtml-create-booking-page-2.php
/* Line 16 */ $booking_form->output()
The extension to display additional fields has an action to display these:
What is the proper way to do what I want ?
Read more here: WooCommerce Bookings: Override admin form