Hello there, @LizUnderwood and @BBF2. Thanks for reaching out.

As for your concern, @LizUnderwood, right now, multicurrency is not an option in QuickBooks Self-Employed (QBSE) UK version. In the meantime, you can manually convert the amount from UK (£) to US ($). 

To learn more about how the invoice feature works in QBSE UK, see this article: Create invoices in QuickBooks Self-Employed.

And for your concern, BBF2, can you please add additional details about the purchase categories you're referring to? Knowing this information helps me provide the right troubleshooting steps to get this taken care of on time. For more information about the available categories in QBSE, take a look at this link: About SA103F Categories.

I appreciate you taking the time visiting us here today, and I look forward to your response.