The company has a Spending Authority Matrix for PO approval.  The matrix has 7 levels of spending with grouping of positions identified:

L1 - $1M - President
L2 - $500K - CFO
L3 - $250K - Directors
L4 - $125K - Managers
L4 - $125K - Coordinators
L5 - $5K - Purchasing Agents
L5 - $5K - Assistants
L5 - $5K - Engineers

How do I implement this so that the Purchase Orders are routed to the next level up when $value exceeds?  And where are these $values setup?  I’d appreciate some detailed guidance.  Thank you.