The Duplicate function creates a copy of the current Order as a draft Manual Order. As with any Manual Order, you can add, remove, or change the line item quantities of this new Order.
Once you've finished modifying the new, duplicate Order, you can elect to Keep & Ship or Cancel the original Order.
Note: The duplicated Order does not retain it's links relating it to the original Order in your Shopping Cart Application. A key result of this is that when Amplifier fulfills the new, duplicated, Order, there will be no signal back to your Shopping Cart Application that the Order has been fulfilled.