How to Configure Customer Hierarchy.......

Dear All,

Business Requirement is-

user want to determine sales value on each level Like.-

National sales Manager(NSM)-->Regional Sales Manager(RSM)--->Zonal Sales Manager(ZSM)--->Area Sales Manager(ASM)--->Sales officer(SO)-->Sales Representative(SR).

Also user only wants to enter sales Representative in sales order as a partner function & upper level hierarchy are automatically determine like SO,ASM,ZSM,RSM,NSM.

Please help how to configure ?

Regards,

Sameer Singh