You can add items to an existing order if the order does not have an order status of No Pending Action, Pending Remove, Removed or Pending Customer Return; and if no payment group has a status of Settled.
You can view the order’s status on the Order View page, and you can view each payment group’s status on the Billing page. For descriptions of all statuses, seeAppendix A, Commerce Status Codes.
To add items to an existing order:
Display the order. Refer to Searching For and Displaying Orders.
In the Shopping Cart section, click Edit.
Add the item using the Product Catalog, or by entering the Product or SKU ID. Enter a quantity, and click Update.
Verify the Shipping and Billing information.
Submit the order.
