Use
Hierarchy structures are the basis for hierarchies. Hierarchies can be used to group master data objects in hierarchy relationships. You can define hierarchy structures in Customizing. In Customizing, choose Advanced Planner and Optimizer (APO) ® Master Data ® Hierarchy ® Define Hierarchy Structure.
Procedure
You can find further information in the IMG documentation under Advanced Planner and Optimizer (APO) ® Master Data
® Hierarchy
® Define Hierarchy Structure.