This is the correct answer to my question:
We can do it globally for all users.
Check Function module exit EXIT_SAPLSUSF_001.
Simply use CALL TRANSACTION 'ZTEST'. inside it and assign it to a project.
Follow below steps:
Goto -> Tcode SMOD ->Enter SUSR0001 -> Click display -> Click Components -> Double click on EXIT_SAPLSUSF_001 -> Double click ZXUSRU01 -> goto change mode -> Enter code CALL TRANSACTION 'ZTEST'. (Your 'Z' transaction) -> Activate.
Now Goto -> Tcode CMOD ->Enter Project name -> Click create ->Enter Short text ->Click Enhancement assignments -> Enter SUSR0001 -> Save -> Click Components -> Click activate.
Log off and login again.
thanks, Divyanshu Srivastava