Approval hierarchy

Would you tell me how to create an approval hierarchy in purchasing and inventory?

Purchasing has two approval hirearchy - Position & employee supervisor
You can get the details in below url
http://www.oracleug.com/user-guide/purchasing-overview/approval-securit…
http://www.oracleug.com/user-guide/purchasing-overview/purchasing-overv…

In inventory , approval is used only for move orders & Planner is the approver for all move orders

The approval in AP, AR , GL, EAM etc are different from all these

Oracle Applications Fusion Cloud - Inventory

Oracle Cloud/Fusion Procurement training will help you develop the fundamental skills required to set up and use the Procurement module. This training covers all the tasks, setups, forms and reports used in Procurement and related modules