Hi Anwer,
From the top of my head there are 2 options. Outline:
1) Use structural authorisation. In the profile in T77PR you replace the root object by a function module.This module finds all positions of the payscale levels allowed (use rh_get_manager assignment as a template).
Then you use an evaluation path including the 008 relationship to find the individuals.
This can be more complex, if other strct profiles interfere or context is switched on.
2) if the field org key (vdsk1) in IT0001 is not required for something else, use this field to duplicate the pay scale level (using BAdIs or, simpler, a batch program). VDSK1 is used in authorisation object p_orgin and p_orgincon.