Assign a currency to a new customer using the QuickBooks Online app

After you turn on multicurrency (which you can do from a web browser by following the steps here), you can choose who pays you with a foreign currency.

1. From the Menu ☰, select Customers.
2. Select + to add a new customer.
3. Fill out the customer's details.
4. Under Customer pays me with, select the currency.
5. Select Done.

Read more about multicurrency here.

Note: Use the same steps to assign a foreign currency to a supplier by selecting I Pay This Supplier With and then select the currency.