Hi Sameer,
Thanks for the reply. I did not see any user exit with in this FM to put my custom code. I think I can use EXIT_SAPLCATS_003, Here I will create ZInclude and put my custom code like calling the CATS_F4_HELP_AWART function and based on the pernr I will get the employee sub group and restrict the values. Please advice if this is not correct user exit.
Thanks
Krish