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TurboTax Business Inc provides the required form to file an amended T2 corporate return.
The process involves making the corrections to the return as required. So if schedule 8 needed changes those changes should be completed.
The amendment process involves sending the whole return again, including any forms with changes. There is a T2 Adjustment Worksheet that needs to be completed before filing the amended return. Completion of this form alerts the Canada Revenue Agency(CRA) that this is an amended filing and briefly explains the changes made. See attached amend.PNG for the required fields to be completed.
Once the T2 adjustment worksheet is completed, you should be able to file the return as CRA will now know this is not the original filing but an adjustment.
Hope this helps.