How do I amend my state form for Alabama with an updated W2c with taxes on overtime omitted?

You would file an amended return and post the Alaska W-2 information in the Federal entry screen.

Log back into TurboTax

1. Go to Wages and Income
2. Select the W-2 to correct
3. Repost any information that changed in boxes 15-20
4. Complete the Alaska interview
5. File the Alaska amended return