Deleting your purchase orders
You can use the Billing and Cost Management console to delete your purchase order at any time, along with all of its notifications and associated contacts. A deleted purchase order can't be recovered.
To delete a purchase order
Open the Amazon Billing and Cost Management console at https://console.amazonaws.cn/billing/
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In the navigation pane, choose Purchase orders.
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Select all of the purchase orders that you want to delete.
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Choose Delete purchase order.
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Choose Confirm.