Hi there, @ KM402. 

Allow me to share some information about in changing your home currency for your foreign vendors. 

Once you select the home currency during the initial setup of your QBDT software, the option to change it is currently unavailable. As a workaround, you can consider utilizing the Multicurrency feature to set US dollars (USD) as your home currency. 

Before we start, please know that you can no longer deactivate the feature once it's turned on. In this case, I'd suggest creating a backup copy of your company file before activating Multicurrency.

I'm adding this article to learn how to use the multicurrency feature in QuickBooks Desktop: Set up and use Multicurrency.

Feel free to add a comment below if you have other concerns or questions. I’ll get back to make sure you’re taken care of. Wishing your business continued success.