Hi Paul,
This isnt really a solution, as you cant create orders in the admin for tickets. Sure you can create an order, but this adds products only and not tickets!
I’m sorry that isn’t working for you, but can you clarify where the problem is? If I create tickets for an event and call one of them “Standard Admission” (as an example), then manually create a new order, I can search for and add that as a line item.
Tickets are, ultimately, just WooCommerce products – and the order editor seems able to make use of them like any other product best I can tell.
If I’m misunderstanding definitely let me know and I’ll take another look.