Array over fields in a data structure

["Lim Hock-Chai" <Lim.Hock-Chai@xxxxxxxx>]

If I have a PF (use it as data structure only) that contains the following like 
below:
     A          R TESTDSFMT        
     A            MYFEC1         3 
     A            MYFEC1OK       1 
     A            MYFEC2         3 
     A            MYFEC2OK       1 
     A            MYFEC3         3 
     A            MYFEC3OK       1 
     A            MYFEC4         3 
     A            MYFEC4OK       1 
     A            MYFEC5         3 
     A            MYFEC5OK       1 
     A            MYFEC6         3 
     A            MYFEC6OK       1 
     A            MYFEC7         3 
     A            MYFEC7OK       1 
     A            MYFEC8         3 
     A            MYFEC8OK       1 

And I've a INPUT file that contain a field XXFEC
     A          R INPUTFMT        
     A            XXCUST         9 
     A            XXFEC          3 
     A          K XXCUST   

If the program needs to loop thru this input file for a XXCUST to load XXFEC to 
fields MYFEC1 to MYFEC8, what would be the easiest way to do this?  I'm going 
blank here.
 
thanks