If you do try transferring in your 2021 tax return and deleting any of your previous spouse's information, I suggest first using forms mode to delete the Personal Information Worksheet for your previous spouse and on the Information Worksheet temporarily changing your filing status to Single. This should cause TurboTax to mark as erroneous at least some of your previous spouse's other information carried in from the 2021 tax return, if any, but it is not guaranteed to mark everything that needs to be deleted. This will likely not catch uncommon spouse-specific entries on the Carryover Worksheet. I would then print and check all forms and worksheets before switching back to step-by-step mode, indicating married and filing jointly with your new spouse. Don't forget to check the information for the state tax return.
I would suggest transferring in your 2021 tax return only if you have a significant amount of your own information carrying forward that would be cumbersome to enter manually. Certainly with the desktop version you can do a lot of experimentation and comparison using separate tax files.
