Approval Rules Best Practices and Questions

Edit 7/29/25: Reworded explanation of current rule logic for clarity, added question 6.

Summary:

Looking for documentation on BPM concepts and best practices as it relates to Fusion Expenses. Existing documentation (e.g., in the Implementing Expenses books) only shows very simple rules.

It seems that BPM rules must be very granular. We have 500+ rules at this time and I want to see if there is a better approach.

I am looking for general guidance, but I have also listed specific questions below.

Content (please ensure you mask any confidential information):

General background on our requirements -

Customer has approx 300 divisions. Each division has their own approvers, and those approvers differ based on what's included in the expense report (corporate card expenses vs. regular expense items).