Hey Gina! Thanks for posting. 
We have a feature that automatically deducts commute mileage from reimbursement claims! It can be turned on in the reimbursement settings. Below is a screenshot of what it (“enable commute deductions”) looks like :
Employees can set their home and office addresses and choose whether to deduct one-way or round-trip mileage.
We’d love to hear how this feature works for you & the team!
Best,
Charlotte