Yes you can record multiple mileage rates in different currencies. We have more details here.
Thank you for your answer. But my question was more about the currencies, if it is possible to add or change the currencies, if our employees work in Germany for e.g. and need to record their expenses in EUROS? Thanks in advance.
The mileage currency is set at the policy level. If you need to have different employees recording the mileage in different currencies, I would suggest creating different policies for the different currency.
Currency is managed from Policies > [Select policy] > Reports Report Basics.
Let me know if you have any other questions!