The order listing page of your store's Admin area (Orders -> Orders List) supports orders' bulk-editing.
First, a store admin can change the payment and fulfillment statuses on a per-order basis.
For this purpose:
On the order listing page, select the appropriate payment or fulfillment status for an order in the respective drop-down;
Click the Save changes button to submit the changes.
If you need to edit more than one order at a time, use check-boxes opposite the orders to select them from the list and the bulk-editing panel at the bottom of the page for alterations.
The options for bulk edit are:
Print selected: A store admin can print an invoice or a packing slip on their choice.
Change the payment status for selected: The payment status should be changed only for the orders placed using offline payment methods. The payment status for the orders paid via online payment processors is updated automatically.
Change fulfillment status for selected: The fulfillment status should be updated each time an order progresses in the fulfillment chain regardless of the payment method used.
Delete selected: A store admin can clear the order history.
Each time an order is updated, a customer receives a special email notification. More info on the email notifications you can find in the Email Notifications section
The bulk-editing tool also allows exporting orders into a CSV file directly on the orders listing page. Use the "Export all: CSV" button for this purpose or select the orders that should be exported and click "Export selected: CSV."