Is it possible to manually enter credit amounts on the 941 in quickbooks online?

Thanks for posting here in the Community, @erinnuccio.

I have some information about overriding Form 941 in QBO. The option to override the form is only available in QuickBooks Desktop. For QuickBooks Online, you'll want to adjust the paychecks to correct your payroll forms.

To make some adjustments to previous paychecks, please contact our Payroll Support. They have the tools to access your account and correct your payroll checks.

Here's how to reach out:

1. Go to Help at the top.
2. Select Contact Us.
3. Enter your concern on the field. QB Assistant will provide link to some answers.
4. Type "I still need a human", then tick the Get help from a human button.
5. Click Chat with us to start a conversation. See the attached screenshots below.

Here's a guide to learn more about filing forms: Pay and file payroll taxes online.

Additionally, here's a link that covers all tasks you can do when using the payroll feature.

Let me know if you still have questions or concerns with payroll. I'll be around for you. Take care and have a great day ahead.