How to reassign expenses that are stuck at inactive or terminated employees?

Content

Some of our users have expense reports that are 'Pending Manger Approval' but the manager has become inactive or terminated. As I have learned through research, I should be configuring due date/deadlines on submissions, but that has not been done yet. Is there a way for me as a system administrator to reassign these expenses to the correct approval staff?

Extra credit question: How is this generally handled from your business' perspective? 

Thanks!

Version

Fusion 20A