Hierarchy with Postable nodes

Hi All,

I am trying to create a Cost Center hierarchy with postable nodes, but am not clear of the steps for the same.

I have to Plan for Cost center's which are in a hierarchical grouping. example

CC Group 1

Unassigned (#)

Cost Center 1

Cost Center 2

CC Group 2

Unassigned (#)

Cost Center 3

Cost Center 4

and I need to plan at the Group level as well as the Cost Center level.

Could anyone help me with the steps for the same, as I am not able to find the details for the same in SAP Help nor in any topic discussed earlier in the forum.

Looking forward to your response.

Anurag