I'm using Turbotax Business 2019 and had this same issue. The accepted answer that says you have to delete your CA return and start over should be removed from this posting. It may have been valid at the time but no longer is and was terribly disheartening for me to read. With Turbotax Business 2019 it's very simple. At the top of the screen click on the Forms button. Then on the left scroll down until you see Form 3554. Click on the form and at the bottom of the screen click the Delete Form button and it goes away.
