Great news, @Leo!
You can write a proposal in QuickBooks Online by creating an estimate. Let me show you how.
- Go to the Plus icon.
- Under Costumers, select Estimate.
- Enter information as needed such as customer's name, product or service and date.
- Click on Save and close.
You can check and read this article to learn more about estimates: Estimates/Quotes - Setup and Function.
You can also check this link to know more about QuickBooks: Getting Started at QuickBooks Online.
It'll be my pleasure to help if you have an other questions.
