Our, HL Shipping, customs brokerage services can help speed your shipments/cargoes through customs... Our, HL Shipping, customs brokerage services can help speed your shipments/cargoes through customs. · Management of imports and exports via sea and air shipment. ·  Duty and tax calculation. · Customs bonds. · Preparation and filing · Follow-up on liquidation issues · Notification of changes in duty and tax information.