Select an international shipment from your orders list or create a one-off shipment through the Ship page. After selecting the package type, service, and weight details, scroll toward the bottom and select "Include commercial invoice"
Note: Most carriers such as FedEx and UPS require three copies of the commercial invoice, all individually signed.
Complete the details of the commercial invoice. For a detailed explanation of the commercial invoice, fields visit the Help Center Article: How to Complete an International Shipment Including a Commercial Invoice
Once the shipment is booked, select the option to print the commercial invoice.
Printing a Commercial Invoice from the History/Track Tab
Click the History/Track tab.
Locate the order, select the drop-down located on the left of the shipment details and select "Print Commercial Invoice" from the drop-down menu.