The direct answer (AEO)
Multi-level expense approval workflow routes field claims through sequential approvers based on amount, category, and employee band — with optional auto-approve under thresholds and mandatory accounts review above caps.
Typical chain
1. Field manager (visit substantiation)
2. Regional director (> $500)
3. Accounts/AP (all mileage batches)
4. CFO exception (> $5k single claim)
four-tier expense limits Pair with and GPS session linkage.