If you used TurboTax online for the 2022 tax return and were filing as Married Filing Jointly, you will need to create a new TurboTax online account if you are making the decision to file as Married Filing Separately in 2023.
After you create the new account, in the My Info section of the program you indicate you are Married and NOT filing the return with your spouse.
On your return you will have to enter your spouse's name and their Social Security number.
Go to this TurboTax website and click on Sign Up to create an new account and a new User ID - https://turbotax.intuit.com/
Also, see this TurboTax support FAQ for filing separately versus jointly and if you live in a community property state - https://ttlc.intuit.com/turbotax-support/en-us/help-article/taxation/better-married-couple-file-join...
