From the dashboard, go to Payroll table.
Select the employee whose payment currency needs to be changed.
Click on Go to profile.
Click on Salary Configuration.
Please make sure you update the following fields:
Month from which salary currency will change
Amount of basic pay in new currency
Once the currency has been updated, you will be to see which month the new currency will be available from.
You can only change the currency of the employee to a currency that is already configured in your payroll.