I can help you amend your forms, zackmaninc.
While QuickBooks Online Payroll doesn't support the amendment of forms, you'll want to manually do it outside the system. No worries, we have available payroll reports that you can run to help you fill out the amended form.
You can use this link to check out our list of available payroll and employee reports and what data it generates: Run payroll reports.
Feel free to use these link for more details in handling your tax filings and payments:
I'm just here if there's anything else that you need help with. You take care and have a great day!