In QuickBooks Online, you can turn on the Multicurrency feature and assign the sterling equivalent to the customer before creating an invoice. Let me walk you through the steps on how you can accomplish this.
Go to the Gear icon.
Under YOUR COMPANY, select Accounts and Settings.
Select Advanced.
On the Currency section, select the Pencil icon.
Toggle the Multicurrency selection to turn it on.
Select Save.
Click Done.
From here, you can go ahead and assign the exact sterling equivalent of your foreign customer and create the invoice accordingly. You can read this article to learn more: How QuickBooks uses exchange rates?
Additionally, I've also included this reference helpful with a compilation of articles you can use in understanding multicurrency: More information about Multicurrency.
Don't hesitate to post again here if you have other questions or concerns with QuickBooks tasks and navigations. I'm always around happy to help. Stay safe and have a good one!
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