Define & explain SAP-HR IMPLEMENTATION WITH MULTIPLE COMPANY CODES

Hello All,

We are looking forward to simple answer regarding an informationL "SAP-HR IMPLEMENTATION WITH MULTIPLE COMPANY CODES"?

MULTIPLE COMPANY CODES INCLUDE 1 COMPANY CODE FOR PARENT COMPANY & REST ARE FOR SISTER GROUP OR SUBSIDAIRY COMPANIES OF EACH GROUP.

THERE IS A QUITE CONFUSION?

WHAT WOULD BE THE BEST PRACTISES TO HANDLE SUCH A SITUATION?