Hey there, tom236.
Thanks for reaching out to the Community for support. I'd be happy to help.
QuickBooks Online has various features that can help make running your business easier. One of these features is called Multicurrency. If you have QuickBooks Online Essentials, Plus or Advance, you can turn this feature on by following the steps in this article. Keep in mind, once the Multicurrency feature has been turned on, you can no longer turn it off. This article will also provide detailed information.
If you have any other questions feel free to reach back out here.