Hi there, panish108.
The Estimate and Quote are just the same. In the Email subject line, you can add the word Quote. However, the [Estimate No.] should be included since it's a code so that the Quote/Estimate reference number will auto-populate when sending an email.
You can check these articles, on how to personalise your sales forms and running some financial reports in QuickBooks:
Drop me a comment below if you have any other questions about quotes in QuickBooks Online. I'll be happy to help you out.
