How can I add a revenue line to my chart of accounts?

I've got your back, @lindak1119.

Do you mean to create a new Revenue (Income, Sales) account in your Chart of Accounts? This can be done with the instructions below:

Creating a New Ledger Account

1. From QuickBooks Online, click the Gear icon (⚙) > Chart of Accounts.
2. Click New. Under Account Type, select Income or Other Income.
3. Browse and select a Detail Type that most closely matches the new account's purpose.
4. Enter a Name for the account and click Save and close.

We also offer a guide on creating new ledger accounts here for your convenience. Check out this quick video example in which I create a basic income account:

Using these instructions, you can create whichever Revenue ledger accounts your business needs. Please touch base with me here should you have any additional questions or concerns, I want to make sure you're taken care of. Thanks for dropping in and have a magnificent rest of your week.