Once you have finished the 2023 return, if you wish, you can transfer the desktop *.tax2023 data file into your online 2024 return if you plan to use Online TurboTax for the 2024. It will, however, require you to start over with the 2024 online return since you can only transfer into a blank new return. Clearing the online 2024 return is all done during the process explained in this FAQ:
FAQ: How do I transfer last year's desktop return into this year's Online TurboTax?
https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/transfer-last-y...
