This JCL defines an ALIAS in the current master catalog. The alias points to the user catalog named in the RELATE clause. Use a STEPCAT pointing to another master catalog when needed. //DEFCAT EXEC PGM=IDCAMS //* STEPCAT DD DISP=SHR etc when needed //SYSPRINT DD SYSOUT=* //SYSIN DD * DEF ALIAS (NAME(PROD) RELATE(SYS1.USERCAT.PROD)) /* // //Pierre G