With FI posting to fixed cost center facility, we can link a particular GL with a particular cost center in simple language.
Means in normal case amount will be booked under Dept. master cost center but if we want to book under fixed cost center then,
Ex: There are hundreds of emps, with assigned dept. master cost centers but if client want to book under single cost center then we need to make changes in configuration as described below_
Payroll: India> Reporting for Posting Payroll Results to Accounting >
You can assign Internal order also in the place of cost center. Further if you want some grouping then you may use business area field ( IT0001) or company code.