MOCKUP LINE[S] linenumber1 [THRU linenumberN]
For example, the following code:
   MOCK    STOCKRPT
   01      TYPE IS REPORT HEADING    
               NEXT GROUP IS NEXT PAGE
           MOCKUP LINES 1 THRU 5
   01      TYPE IS PAGE HEADING
               NEXT GROUP PLUS 2
           MOCKUP LINES 6 THRU 8
   01      TYPE IS CONTROL HEADING WS-LOCATION-CODE
           MOCKUP LINES 10 THRU 12
   01      PART-DETAIL TYPE IS DETAIL 
               NEXT GROUP PLUS 1
           MOCKUP LINE 13
   01      TYPE IS CONTROL FOOTING WS-LOCATION-CODE
           MOCKUP LINES 14 THRU 19
   01      TYPE IS CONTROL FOOTING FINAL
           MOCKUP LINES 20 THRU 24
   01      TYPE IS PAGE FOOTING
               LINE PLUS 2
           MOCKUP LINE 25
   01      TYPE IS REPORT FOOTING
               LINE PLUS 2
           MOCKUP LINE 27
               	 Corresponds to the following mock-up.:
*************************TOP OF DATA**********************
                 WONDERFUL WIDGETS INCORPORATED
                         MID-ATLANTIC
                          STOCK REPORT
                           XXXXXX XXX
                         MID-ATLANTIC
                         STOCK REPORT
                         XXXXXX XXX
LOCATION       LAST COUNT   QUANTITY   QUANTITY   QUANTITY
                  DATE      IN STOCK    ISSUED    RECEIVED
XXXXXXXXXXXX    99/99/99     ZZZ,ZZ9     ZZ,ZZ9    ZZZ,ZZ9
                           ---------  ---------  ---------
TOTAL BY LOCATION:         Z,ZZZ,ZZ9   Z,ZZZ,ZZ9  Z,ZZZ,ZZ9
TOTAL NUMBER OF SALES BY LOCATION:       ZZZ,ZZ9
TOTAL WONDERFUL WIDGETS IN STOCK:      Z,ZZZ,ZZ9
TOTAL WONDERFUL WIDGETS ISSUED:        Z,ZZZ,ZZ9
TOTAL WONDERFUL WIDGETS RECEIVED:      Z,ZZZ,ZZ9
TOTAL WONDERFUL WIDGETS SOLD:          Z,ZZZ,ZZ9
                             PAGE ZZZ9
                    *****  END OF REPORT  *****