Modifying an order allows you to change the Order Type, Source Code, Sales Channel, Order State, and Estimated Completion Date, as well as add or edit order line items.
To modify an order:
From the Orders tab, right-click on the desired order and select Resume Order (see Viewing Orders). This displays the Edit Order Wizard window.4

Notes:
Orders with a status of Assembled, On Hold, Submitted, and Error can be modified. Orders that have a status of Completed, In-Process, and Cancelled cannot be modified.
You can also modify an order from the Search Results window.
Right-click on the desired catalog item and select Edit Order Line Item. The Edit Order Line Item window is displayed. See Editing Orders/Order Line Items for instructions on modifying an Order Line Item.
Modify and save the necessary information. Click Finish to exit the Order Wizard.