Hello Joe,
When you say you cannot get the ADDSD to work, do you mean that you see an error when it is executed, like this:
IKJ56712I INVALID KEYWORD, .*
C4R917E Post-command failed, processing terminated
or do you mean something else?
Since the October 2024 SSE, zSecure Command Verifier supports invoking REXX or CLIST via =PSTCMD profiles and there is an example of this here:
https://www.ibm.com/docs/en/szs/3.1.0?topic=replacement-example-5
Perhaps that could be used to generate the required ADDSD command you need.