How do I replace an existing W-4 with an updated W-4

Let me first welcome you here in the Community,  usertreasurer6.

I know a way on how to update an existing W-4 in QuickBooks Online.

Here's how:

1. Go to the Payroll menu and then choose Employees.
2. Select the name of the employee.
3. Choose Edit ✎ beside Pay.
4. Hit the 2020 W-4 or later radio button.
5. Click on Update
6. Enter the employee's W-4 information into the form.
7. Select Done to save.

Once done, you can print a W-4 form from your QuickBooks Online account.

I've also added an article that'll help you learn more about the updated W-4 form:  FAQs on the 2020 Form W-4.

In case you'll need assistance in dealing with payroll tasks, don't hesitate to get back on this thread. We're always here to help you.

Hi usertreasurer6,

Hope you’re doing great. I wanted to see how about updating your existing W-4. Was it successful? Do you need any additional help or clarification? If you do, just let me know. I’d be happy to help you at anytime.

Looking forward to your reply. Have a pleasant day ahead!