Welcome to the Community, @JoanneP.

In QuickBooks Online (QBO), once the Multicurrency feature is turned on, you can go ahead and sell a product (with home currency) to a customer with a different one. All you need to do is to add their currency to their information.

Here's how:

1. In QBO, go to the Sales menu at the left pane to get to the Customers page.
2. Click New customer, then enter the necessary information.
3. In the Payment and billing tab, pick the customer's currency in the This customer pays me with drop-down.
4. Once done, hit Save. 

For more information, refer to this article: Turn on and use multicurrency.

However, the ability to enter products and sell them in a currency different than our home currency is currently unavailable. I can see how having this feature would be helpful for you and your business. Rest assured that I'll pass along your suggestion to our Product Developers. They're always looking for ideas from users on how to improve QBO.

In the meantime, I recommend visiting our Blog site. This is where we share recent happenings and future developments, such as updates to newly added features.

Just in case, I'll add this article for future reference: Enter home currency adjustments for your foreign balances.

Please leave a comment below if you have any other issues or concerns, and I'll get back to you right away. I'll be here to help. Enjoy the rest of the day!