Turbotax online isn't designed for that. You would have to make additional online accounts with different user name and passwords, and enter your details all over again. You can also try the TaxCaster app.
TaxCaster tax calculator
To do what you want in Turbotax, you would have to buy the desktop version from a CD or download to install on your own Mac or PC. Then download your 2023 data file, and make multiple copies (like having multiple copies of a word processor or spreadsheet document). You can change the copies as long as you keep the unchanged original in a safe place.