The FDA Product Code Builder is a web based application (with a tutorial) that can be accessed at the following URL:
Note: The stand alone PC based FDA Product Code builder is obsolete and is no longer supported. Any product codes changes made after April 2000 will not be reflected in that product. Use of the PC based product code builder can result in the building of inaccurate or obsolete codes. This can cause rejection of electronic submissions of FDA data to Customs.