How do I file a tax return for a live in partner both US and New York. How do I do that?

When you use Online TurboTax, you get one return per fee.  Each return needs its own account and user ID.   If you use the same account and user ID for a second return, you overwrite the first one and lose it forever.

https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-online/00/25596

I waited for two plus hours on hold Sunday night and the system was so overloaded I did not get a text to my girlfriend's phone to establish an account for her. She does not want to have her taxes filed right away so I will probably file them next week when I am not working 12-14 hours a day.