Restriction: You can only delete a custom user type if it is not being used in any of the file definitions in the catalog. 
                  		
               
 
               		
                
                  		  
                  - On the 
                     			 Tools menu, click 
                     			 Custom Data Types. 
                     			 
                     The 
                        				Custom Data Types tab is displayed. 
                        			 
                      
- Right-click the type name for the existing data type to delete, then click 
                     			 Delete. 
                     		  
                  
- Click 
                     			 Yes to confirm. 
                     			 
                     The user type is deleted. 
                        			 
                      
- Click 
                     			 Save to Catalog. 
                     			 
                     The changes are saved to the catalog.