From the manifest created, go to Truck or Trailer Information > click add IIT > Choose EC/EI/MC/MI. 

EC – Shipment consists of empty IIT’s covered by Carrier’s bond
EI – Shipment consists of empty IIT’s covered by Importer’s bond
MC – Shipment consists of merchandise and IIT’s. IIT’s covered by Carrier’s bond
MI – Shipment consists of merchandise and IIT’s. IIT’s covered by Importer’s bond