Position Hierarchy

 Hi,

I am having a few queries pertaining to Position Hierachy which are mentioned below:

1)Do we define Position Hierarchy at Business Group Level or Operating Unit level?

2)If we define  a position Hierarchy at Business Group level.Can we share it between two operating unit under same Business Group?

3)If we define the two position  Hierarchy (Viz. A and at Business Group level. So, can we use Position Hierachy A for one operating unit and Position Hierarchy B for  second Operating Unit B under same business group?

Looking for urgent help!!

Thanks & Regards,

Ravi Singh.