On each order there is a "Status" box that can be used to keep notes on the order that are visible on the dashboard. The following will explain what the status box does.
To add a custom status to an order, look to the left side of the order underneath "Order Owner."
Enter the text you would like and click save.
This text will then be visible on the dashboard to all of your company's admins here:
The status will be visible until the order is closed.
Searching by status:
The search function at the top of the dashboard has an option to search by status, which will sort your dashboard by the contents of the status box. Learn more about sorting your dashboard.