The international Harmonized System (HS) is administered by the World Customs Organization and serves as the foundation for the import and export classification systems used in the United States. The United States (U.S.) import classification system, the Harmonized Tariff Schedule (HTS) administered by the U.S. International Trade Commission (USITC), and the U.S. export classification system, the Schedule B administered by the U.S. Census Bureau, Foreign Trade Division, both rely on the international HS codes for their 4- and 6-digit headings and subheadings. The World Customs Organization updates the HS System approximately every five years. The year 2012 marked the most recent HS revision, meaning the next revision will not be due until 2017.
Since greater commodity detail are needed than the 4- and 6-digit HS headings and subheadings, the HTS and Schedule B classification systems expand their coverage to statistical descriptions at the 10-digit level. HS numbers and Schedule B numbers will be the same up to the first 6 digits as the importing country's classification code.
A Schedule B number is a 10-digit number used in the United States to classify physical goods for export to another country. The Schedule B is based on the international Harmonized System (HS) of 6-digit commodity classification codes. There is a Schedule B number for every physical product, from paperclips to airplanes.
For how to get the Schedule B number, please refer to this link：https://uscensus.prod.3ceonline.com
Schedule B numbers are administered and used by the U.S. Commerce Department, Census Bureau, Foreign Trade Division to collect and publish the U.S. export statistics. Schedule B numbers are required to be reported in the Automated Export System (AES) when shipments are valued over $2,500 or the item requires a license.