Our industry picklist is not granular enough and we would like to add a sub-level to give greater definition. Our intention was to take the incoming SIC code and have a program assign an industry and sub-industry category based on the code. Before we start doing the work for this program I wanted to check whether it is indeed best to use the SIC code. I see there are also UK SIC codes based on NACE codes, NAICS which a more up to date version of the SIC codes but only cover Mexico, Canada and US and DUNS numbers which seem to be a D&B proprietary system.
As we are a global company we need to have numbers that cover all regions and want the freedom to move to different data vendors in future. What do other companies do/use?