You're on the right track, immarkbernhardt
All you need to do is categorize the ACH transaction on your Banking page. To know what specific category, I recommend consulting your accountant for specific instructions.
If you don't have one, check out this link to find an accountant near you: https://quickbooks.intuit.com/find-an-accountant/.
Another way of recording the sale of the domain name is to set up your assets. Then, create a journal entry to track your assets and their depreciation.
For instructions and detailed steps, check out this link: Depreciate assets in QuickBooks Online.
Learn more about reviewing bank entries through this article: Categorize and match online bank transactions in QuickBooks Online.
Let me know if there's anything else I can help you with this by commenting below. I'm always right here to provide the information you need.