As soon as an order or preorder has debited, it is considered finalized and cannot be cancelled through self-service options. Please be aware if your order will debit immediately at checkout since you will not have a self-service option to cancel the order after it is placed.
Navigate to the "Manage Order" screen, Follow this article if you are unsure how to find this page.
Unfortunately, Orders cannot be partially cancelled. Please note that we cannot reinstate a cancelled order once the cancellation process has begun.