What are the best practices for deleting obsolete PO approval routes?

JDE E1920 v9.2.7.4

I am planning to clean up obsolete purchase order approval routes but want to understand any impacts. For example, would there be an impact to historical PO that have completed the approval process and/or has been paid in full?

What are some best practices for deleting obsolete PO approval routes?

Would love to hear the step-by-step process from others that maintain the P43008 module