Hello, the code of goods and services is six digits, the first two digits indicate the category of goods and services, and the last four digits indicate the code of goods or services. For example, "120092" is the No.92 commodity in the twelfth category, and the code of six digits plus "c" indicates the general goods and services in China that are not listed in the international classification, such as "C 128". Teacher Wang, registered in Tianjin, is happy to help you.