On this page, you can view all created orders. Orders have 3 statuses. New orders will be with Pending status. The other 2 statuses are Completed and Partially received. You can view/edit an order from the edit button.
When you are editing order and if it is with a Pending status you can still add products to it. If the order is with the status Partially received or Completed you’ll see only the button Receive Inventory. When you click it a window will open and you can mark the progress of the order. There are buttons to Accept all and Reject all products. You can manually add the received/rejected quantity, too.