Business & farm

I have the same issue in Turbotax Business 2023. There is no Code Z in the drop-down list (see attached photo). It goes from Y to AA. Code Z was present in prior years. I spent 3 hours on the phone with tech support and they had no solutions. They gave me another version of the software and it had the same problem. Is this something that is being worked on? If not, can you explain in more detail what you mean by selecting the box in Section B1? Perhaps send a photo to show what you mean? Thank you.