You would only need to file the New Your return if you actually physically worked in New York. If so, you would be a non-resident of New York if you were only there temporarily.
Assuming you worked in New York, you should file a non-resident return in TurboTax for New York first. Then file a Maryland resident return.
To exclude your income per the US/China tax treaty, first report the income as you normally would. Then, you need to enter a negative number for the amount you are excluding as "Other Income" as follows:
1. Go to the "Federal" section of TurboTax
2. Click on "Income and Expenses"
3. Find "Less Common Income" and choose the last entry "Miscellaneous Income"
4. On the next screen, "Miscellaneous Income" choose the last entry "Other Reportable Income"
5. Enter a description for your entry (tax treaty code or description), and enter the taxable amount you want to exclude from income as a negative number
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