If you created a shipment outside of ScanPower, e.g from Inventory Lab or elsewhere, you can import it by clicking on the "Import" button at the top of the Shipments panel.

Step 1: Select the required location or can you also select all locations before clicking on "Import". 

Step 2: Click Import (as per the screenshot above).

Step 3: Enter the shipment ID or enter the date ranges of the shipment you want to import.

Step 4: Select one or more shipments (will turn blue as above), then click the "Import" button on the dialog.

You will see the shipment(s) in ScanPower momentarily.