Just start a new tax return for the mock state tax return.
Click on the File menu at the top left of the desktop program screen. Click on New Tax Return.
See this TurboTax support FAQ for a joint federal return and a separate state return - https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-prepare-a-joint-federal-return-and-separate-state-returns/01/25564
Sounds like it. Did you see this article on how to file a joint federal return and file separate state returns…..
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-prepare-a-joint-federal-return-and-separate-state-returns/00/25564
Just start a new tax return for the mock state tax return.
Click on the File menu at the top left of the desktop program screen. Click on New Tax Return.
See this TurboTax support FAQ for a joint federal return and a separate state return - https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-prepare-a-joint-federal-return-and-separate-state-returns/01/25564