Full Bookings support for costs
Cost of Goods supports WooCommerce Bookings in a very basic way. You can set the cost for the booking product as a whole currently. This is helpful for bookings like appointments or event tickets that will have a set cost for the booking purchase. For example, if you sell appointment blocks, you can set a cost for this booking.
If you have a booking that uses blocks configurable by the customer (like hotel rooms), the cost cannot be set per block. This feature would add per-block costs for more fine-tuned cost control.