How to apply multicurrency to each sales

Once you have enabled the multi currency feature, you have to create first a customer profile and assign it with a certain currency prior to create an estimate, an invoice, or a sales receipt. Another option to deal with any multi currency transaction to get a better exchange rate and lower fee.

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Hello there, jennyhan.

It's my pleasure to have you here and help you out with your concern.

That's great that you've done turning on the Multicurrency feature by yourself. And yes, we can apply different currency to our customers and the sales transactions.

As mentioned by Fiat Lux - ASIA, we'll need to assign our customers to their currency by following the steps below. Here's how:

1. Go to Sales on the left panel.
2. Within the Customers tab, click the New customer at the upper-right corner.
3. Record all your customer's information by adding them in the fields. 
4. In the Payment and billing section, click the This customer pays me with drop-down arrow.
5. Select their currency. Then, hit the Save button.

Once we use the customer when creating sales transactions, it'll automatically generate the currency you've set up for them. Let's this sample screenshot for additional reference:

 Also, I'm adding these articles where you can gather additional details on how to manage and handle multiple currencies in QBO:
 

• Add an account that uses a foreign currency.
• More information about Multicurrency.

Please let me know if there's something more I can help you with QuickBooks. I'd be glad to help you further. Keep safe and be well!

I want to invoice US DOLLAR  currency