Importing shipment with Shipment Container column will need WPCargo Containers Addon.

1. Create a container in the Frontend Manager Dashboard.
   
2. Go to Import/Export. On the Export Tab select column header to be included on the template.
   
3. Go to Import Tab and click Download CSV Template
   
4. Fill out the CSV File. Make sure that the Container Number already exists.
   
5. Import your CSV File. Check the data on frontend dashboard.