Hello, for goods and services, the codes use six digits. The first two digits indicate the category of goods and services, and the last four digits are the code of the goods or services. For example, "120092" is the twelfth category. For commodity No. 92, the code with a six-digit signature plus "C" indicates my country's general commodities and services that are not included in the "International Classification". For example, "C120008" is the domestic commodity No. 8 of the twelfth category. Tianjin Trademark Registration Teacher Wang is very happy to help you.