In the Attribute Filters section of the Shipment Filters panel, click Add Stop.

For the Location select Any Stop.

For the Type select Port Code.

For the Logic select is.

For the name select the port code.

Click Add Criteria.

For the Type select Stop Type.

For the Logic select is.

For the name select PORT_OF_DISCHARGE.

Click Apply Filters.

The Shipments List is sorted by the selected criteria.