Setting up custom extension fields
You can create your own custom extension fields should the current standard extension fields not suit your requirements.
           To create a custom extension field, enter or query the analysis dimension for which you want to maintain custom extension fields in Analysis Dimensions (AND). From the  menu select  to open the Extension Fields form and select . A maximum of 100 codes can be created per additional code list. 
           
          
            Note: Codes cannot be deleted if being used by an extension field.
           
          
           Note:  Updating and deleting custom extension fields may impact on existing analysis codes and the functions which are using them.