You can only delete the number formats that are specified.
 
 
  - From the Master Files - System list, select Formats. 
   
    The 
Formats List window opens. 
    
    
  - Double-click a format in the Formats list.
   
    The 
Formats window opens. 
    
    
  - In the Acceptable Number Formats list, select a number format. 
 
  - Select Open Menu 
 , and then select Delete. 
   
    Note: You can also right-click a number format, then select Delete.