Step 1: Go to SALES, then click on Manage Orders.

Step 2: Select the order, then click on its Edit button.
Reminder, order status needs to be Processing to change the Order Quantity.

Step 3:
Go to Products tab.
To change the Order Quantity of a line item, remove the line item from the order first by clicking on its Delete icon.

Step 4: Click on OK to continue.

Step 5:
Notification appears once product has been removed.
Click on Product Name/SKU dropdown to select the product.

Step 6: Enter the new Order Quantity, then click on Add to Order.

New Order Quantity of the same product appears on the same order.

Step 7: Click on Save or Save & Close once done.

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