Restrict users to view requsitions for some dept

[abhgaur@gmail.com]

Hi,

iProc/Purchasing does have an option where you are restrict requisitions access either to your department, yourself.
I will really appreciate if you can provide some pointer which enable to put a control that users can access there and some specific departments only.
eg-
User A sees requsitions corresponding to Dep C , Dep B , Dept A (His Dept)
User B sees requsitions corresponding to Dep A , Dept B (His Dept)

Thanks
Abhishek