Usually for an application, you have standard of using same first 2 characters for all the elements(AB) related to an application.. If there is a change and you want the first 2 chars to be changed to something different (CD)..
The below JCL will help (Inlude all the members)

//JOBNAME JOB ,,CLASS=0,NOTIFY=&SYSUID
//STEP01 EXEC PGM=IEBCOPY
//IN DD DISP=SHR,DSN= Source Dataset
//OUT DD DISP=SHR,DSN= Final Dataset
//SYSPRINT DD SYSOUT=*
//SYSUDUMP DD SYSOUT=*
//SYSIN DD *
COPY OUTDD=OUT,INDD=IN
SELECT MEMBER=(ABP12345,CDP12345,R)
SELECT MEMBER=(ABP12346,CDP12346,R)
/*

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