With external filename assignment, the filename is specified in the SELECT clause as follows: 
               	 
            
 
            	  select filename
     assign to external external-file-reference 
            	 where the parameters are: 
               	 
            
 
            	 
            
               		
               		  
               - filename
                  		  
               
 
               		  
               - The filename of the file that is to be assigned.
                  		  
               
 
               		
               		
               		  
               - external-file-reference
                  		  
               
 
               		  
               - A COBOL word that identifies the specified file to the external environment for possible further mapping. If 
                  			 external-file-reference contains one or more hyphens, all characters up to and including the last hyphen are ignored.
                  		  
               
 
               		
               	 
            
 
            	 
            See 
               		Filename Mapping for more information.