Go above to my original answer and click the "How do I cancel or undo an amended return in TurboTax Online?" link and follow those steps to undo the amend you did. After you have done those steps, double check to make sure that W-2 you added is removed. Use these steps to do that:
1. Click Tax Tools to the left, then Tools
2. Go to Delete a form and see if the additional W-2 still shows in that list
3. If so, delete it and make sure it's the one you added after the fact and not the one that was already there (if you had one already there).
