How to support two COBOL Compilers?

Document ID : KB000110970
Last Modified Date : 13/08/2018
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What is the preferred way of handling two different COBOL compilers so that programmers can test with the new compiler? 
Copy the PARMLIB library to a new name.  Modify TIRHE with a second version of COBOL (TIRC2VER) and the corresponding library name (TIRC2NAM).  Create a new logon proc by copying the existing one and allocate the new PARMLIB library.  This way the same software libraries will be used and updated when PTFs are applied.  PTFs never affect PARMLIB.