The Order Recurring Transaction Summary form will be opened when recurring order transactions. This form will list all the Orders created after processing a recurring transaction for all the orders selected, thus giving you summary on the newly created orders.
In the PO Number field, the only entry field, enter the PO Number specific to the Orders created. There is also an ellipse button to the left of the Order ID that when clicked will bring you to the actual transaction.
See Override Transaction Numbers of Recurring Transactions to show you how to use the Order Recurring Transaction Summary form.