
US Customs Entry Process

Purpose
When foreign merchandise arrives in the United States, the following entry process takes place:
Goods may be entered for consumption, entered for warehouse at the port of arrival, or they may be transported in-bond to another port of entry and entered there under the same conditions as at the port of arrival.
If the goods are to be released from Customs custody on entry documents, an entry summary for consumption must be filed and estimated duties deposited at the port of entry within 10 working days of the time the goods are entered and released.
Immediate Release
Under some circumstances, you can arrange in advance of arrival for immediate release of a shipment using Form 3461 (Special Permit for Immediate Delivery) . Immediate release with Form 3461 applies to
Certain restrictions apply to each of these items, so check with the customs office for more detailed information.
Postponed Release
If you want to postpone the release of the goods, they can be placed into a bonded warehouse under a warehouse entry. Such goods may remain in the bonded warehouse up to five years from the date of importation. Goods in a bonded warehouse may be reexported without paying duty or you can withdraw them for consumption once you pay duties owed.

You can find information about bonded manufacturing warehouses section 311 of the Tariff Act. (19 U.S.C. 1311).