Adding records to QSAM files

To add to a QSAM file, open the file as EXTEND and use the WRITE statement to add records immediately after the last record in the file.

To add records to a file opened as I-O, you must first close the file and open it as EXTEND.

related references  
READ statement (Enterprise COBOL for z/OS® Language Reference)  
WRITE statement (Enterprise COBOL for z/OS Language Reference)