How can I record sales transactions with two different currencies?

Good to see you in the Community, userwirelineelectric.

Let me share some info about your concern.

The Multicurrency feature helps you record transactions without worrying about exchange rate conversions. Currently, adding multiple currencies in a sales transaction is unavailable. 

You can only assign a single currency to most types of accounts, including customers, suppliers, bank and credit card accounts, accounts receivable, and accounts payable. 

To learn more about the Multicurrency feature, please check out these articles:

• Learn about Multicurrency in QuickBooks Online
• Turn on Multicurrency

If you have more questions or need help with other concerns, please let me know in the comments below. I'd be happy to help you out some more. Have a good weekend!