All TriNet Expense Management accounts are setup with a default base currency of USD.
To setup a different default base currency, any user can go to Settings > Personal Settings > Expenses.
For Base Currency field, select your desired currency in the drop-down list and click Save.
A Currency Rate Increase can be added if applicable for the user's account.
Example: If you get charged 4% from your credit card provider for all foreign transactions. Simply add the percentage and any foreign currency added will include this rate increase. Rate increase is calculated when an expense is added to a report.