This is the region code maintenance option for the CLI process. It is part of the CLICODES subsystem and is used to create, amend and delete this particular type of code. Region codes are used for additional geographic coding into regions of a country e.g. in the U.K. 'Midlands' or 'East Anglia', in the U.S.A., 'East Coast' 'West Coast'. These codes and their description are company nominated, i.e. they do not need to follow established map divisions.