Greetings!
Generally, the form that you would want to fill out using TurboTax is form IT-360.1.
https://www.tax.ny.gov/pdf/current_forms/it/it360_1_fill_in.pdf
https://www.tax.ny.gov/pdf/current_forms/it/it360_1i.pdf
You can allocate specifically what income is attributed to New York City. In this case, it would be only the spouse income based on your post.
Best regards!
