Amending a Home & Business Return

I'm self-employed and completed my 2023 return with TurboTax Home & Business. I'm also self-insured. Today, while scanning a signed copy for the financial aid office at my daughter's school, I discovered a HUGE error under BUSINESS EXPENSES — I inadvertently added an extra digit to the amount I paid in health insurance premiums - a difference of $128K!


When I attempt to amend the return (using a saved copy of the original), there are no options allowing me to edit the business section where the error was made. If I select OTHER TAX SITUATIONS ––> AMEND A RETURN, I'm taken to a screen with options to amend my personal return, but nothing for business. I can see the error in the Medical Expenses column under Personal Deductions & Credits, but when I click UPDATE, there are no screens that allow me to edit the amount.

 

Is this even possible?