Answer / premkumar

Since it is concatenated, you can't have DD names as
mentioned in the previous responses. suppose your 4 dd
statements inside a proc are as below

//myproc PROC
//STEP01 EXEC PGM=progname
//DD01 DD DSN=userid.base.file1
// DD DSN=userid.base.file2
// DD DSN=userid.base.file3
// DD DSN=userid.base.file4
//*

Now you can override the 3 dd statements in JCL as
//POCNAME1 myproc
//STEP01.DD01 DD DSN=userid.base.file5
// DD DSN=userid.base.file6
// DD DSN=userid.base.file7

Note: the fourth file has been left as it is because the
questionsis to override only the first 3 statments.

Answer / mchava

//PROC
//STEP1 EXEC PGM=PGM1
//dd1 DD dsn=file1
//dd2 DD dsn=fel2
//dd3 DD dsn=file3
//dd4 DD dsn=file4
//PROCSTEP1.dd3 DD dsn=file5
will override the dd3 file3 with file5

Answer / y@$w@nth

suppose your 4 dd statements inside a proc are as below

//myproc PROC
//STEP01 EXEC PGM=progname
//DD01 DD DSN=userid.base.file1
//DD02 DD DSN=userid.base.file2
//DD03 DD DSN=userid.base.file3
//DD04 DD DSN=userid.base.file4
// PEND
//STEP02 myproc
//STEP01.DD03 DD DSN=userid.base.orfile3
//

STEP01.DD03 DD DSN=userid.base.orfile3 this tells that
override the DD statement which name is DD03 inside a proc
myproc and inside STEP STEP01

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