For Transit Cargo, CBP requires Foreign Importers which goods are either FROB (freight remaining on board) which makes a stop at the U.S. before their final destination of arrival to the foreign port of unlading to provide 5 data elements electronically.
STEP 1: In ISF 5 menu, click Create. Key in all necessary fields.
Section #1 – ISF Shipment and Filer Reference.
Section #2 Commercial Party.
Section #3 Delivery Location.
Section #4 Harmonized Tariff Schedule (HTS).
STEP 2: Once done, Go to Section #5 – Complete ISF and hit “Save as Draft” button. You can still double check the information as long as it is in Draft status before you submit to customs.
STEP 3: For ISF submission, in Section #5, you may send as Add, select an Action Reason Code (you may refer to the legend) and hit “Save & Send” button.
Legend:
Compliant Transaction – All data verified and correct
Flexible Range – Importer, Consignee, Country of Origin and HTS code not verified
Flexible Timing – Container Stuffing Location and Consolidator info not verified
English 
Chinese (China) 
Chinese (Hong Kong) 
French 
German 
Italian 
Japanese 
Portuguese 
Romanian 
Slovak 
Spanish (Colombia) 
Spanish (Chile) 
Spanish (Ecuador) 
Spanish (Mexico) 