https://www.fda.gov/food/importing-food-products-united-states/prior-notice-system-interface-pnsi-step-step-instructions-using-carrier-code-wizard
Prior Notice System Interface (PNSI) Step-by-Step Instructions: Using the Carrier Code Wizard | FDA
Step-by-Step Instructions for using FDA's PNSI (Prior Notice System Interface) Carrier Code 'Wizard'