Create an Sales Order with one line that has both Buy from and Transfer From steps in Supply Order

Consider an Org Structure with 2 Inventory Orgs 'A' and 'B'. Org 'B' has a real life limitation of receiving items from Suppliers and hence all items in Org 'B' are transferred from Org 'A'.

Customer wants to place an Order for an item which is never stocked in Org 'A' or Org 'B' and wants to pick it up from Org 'B'. Is there a way to setup this in such a way as to ensure that there is end to end visibility (basically reservations at all stages similar to Back 2 Back).

e.g. The Customer Order is placed with Warehouse as 'B'. A supply Order is created to Transfer from 'A', but since this item is never stocked, a Buy-from supplier is created to bring the item into Org 'A' and then transfer to Org 'B'.