Select the L class you want to delete.
       

       Click Menu -> Delete L Class.　　   
      

       Alternatively, right-click on the selected Lclass.  
      

       The L class deletion screen will be displayed.  
      
       When you click the Delete button, a confirmation screen will be displayed.
      
     Click the "Yes" button to delete the class.   
      
      The lower Sclass and keywords will also be deleted.