I don't know about the logic required to create a member -- Kolusu might have 
the  best idea.  But creating one long sequential file with all the members and 
using IEBUPDTE is pretty simple: 

//STEP1    EXEC PGM=IEBUPDTE,PARM=MOD
//SYSPRINT DD   SYSOUT=*
//SYSUT1   DD   DISP=OLD,DSN=SOME.PDSE
//SYSUT2   DD   DISP=OLD,DSN=SOME.PDSE
//SYSIN    DD   DATA
./        ADD   NAME=BLUE1

The sky appears blue because of a
phenomenon called Rayleigh scattering.

./        ADD   NAME=BLUE2

When sunlight enters the Earth's
atmosphere, it is scattered in all
directions by the gases and particles in
the air.

./        ADD   NAME=BLUE3

Blue light has a shorter
wavelength and is more easily scattered
than other colors, which is why we see
the sky as blue during the day.

/*
//

(I've included blank lines around the text for clarity here.  All that's needed 
between members is the ./ ADD NAME=membername.) 

This assumes you want to recreate the PDSE each time.  "Monica" says IEBUPDTE 
won't delete from a PDSE like it will from a PDS.  (I've not found "Monica" to 
be all that accurate so far though.) 

Hth,
 
Wendell 

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