SECTIONs in COBOL can be required or optional, depending on which DIVISION they are in.
DATA DIVISION.
FILE SECTION.
FD SAMPLE-FILE
01 FILE-NAME PIC X(20).
WORKING-STORAGE SECTION.
01 WS-STUDENT PIC A(10).
01 WS-ID PIC 9(5).
LOCAL-STORAGE SECTION.
01 LS-CLASS PIC 9(3).
LINKAGE SECTION.
01...
