Hey there, @kmathis1.
Welcome to Community. I'm happy to assist with filing a DE9C and adjusting the state wages.
At this time, we do not have amended forms in QuickBooks Desktop. However, you can fix the wages in the file, and then use the data to fill out the amended form.
This article explains how to use a wage base adjustment to correct an employee's year-to-date (ytd) information (wage base and tax amount) for flat rate taxes such as FUTA, Social Security, Medicare, and SUI: https://quickbooks.intuit.com/learn-support/en-us/annual-employer-forms/entering-wage-base-and-tax-a...
If you have further questions or concerns, please feel free to reach back out. Have a great weekend ahead!