Hello,
The only way to do that is to set the related Properties right from your custom action code implementation code.
Please note that you can't set a Property from a .EXE Cusom Action. Also, please bare in mind that the .EXE custom actions must return a value of "0" in order to succeed, otherwise the installer will interpret it as a failure.
As a workaround for this, you can create your .EXE custom action as a DLL file using our
"How to integrate and debug custom actions" tutorial.
Best regards,
Catalin