Closing Orders
Statuses
To close an order, set the order to "Closed" status.
tip
Similarly, once an Invoice is in "Paid", "Void" or "Uncollectible" status, then it is closed or completed.
Archiving
You can't "archive" orders or invoices either, since you'll often need to refer back to them and aggregate them in various reports. Unless you delete an order or invoice, it hangs around for life.