To add a currency to a payroll:
- go to the 'Setup', then 'Currency' menu options.
- press the 'Insert' button to add a new currency.
- press the 'Change' button to change a conversion rate, if necessary.
You will notice that the default (base) currency that was selected when creating the payroll comes through automatically, as shown below:
See the topic "Multi Currency' under Further Topics for more information about Multi-Currency setup. See this link to add further currencies and exchange rates.