During the buy posting process, if the Buyer selects the FBO option, the Buyer will be able to select a NAICS code once they have selected their category. The NAICS code list is generated based upon the category and sub-category selected by the Buyer. Unison Marketplace will suggest a NAICS codes based upon the category and sub-category selected, however, Buyers have the option to select a different NAICS code that they feel is more applicable. The following link will provide Buyers with a search tool to help find the most appropriate NAICS code: http://www.census.gov/eos/www/naics/