When you create a shipment, you can assign it a reference name or number that aligns with your customers' or your business systems. This reference can contain letters and/or numbers, and can be a Purchase Order (PO) number, a customer’s job number, a Bill of Lading number or even a group of words that identifies the shipment. To use this reference to track your shipment, go to the main Tracking page and select Track by Reference. Input your reference in the Shipment Reference field, indicate whether your shipment is package or freight, and select your shipping dates. Then select the Track button.