With each user in AutoEntry, you can choose which mileage rates set up on the account, they can use and choose from. You can allow submitters to use multiple rates depending on their requirements if needed too.
First, simply click on edit to the left of the submitters name and click on the settings tab:
In the section for 'Allowed Mileage Rates', simply check the box for the rates this submitter is allowed to use:
When the submitter is adding a mileage expense, they will then have a drop down menu of the rates they can choose from to apply to the expense: