You cannot combine them. Each tax year is separate and must be prepared and filed separately. If you used TurboTax for your federal for 2016 then you could go back and do the state. Or you could just go on the the state's website and prepare it by hand.
To use TurboTax: To finish a prior year return started in TT online:https://ttlc.intuit.com/questions/2559403-how-do-i-finish-a-prior-year-return-that-i-started-in-turb
Note: Your 2016 state tax return cannot be e-filed. It has to be printed, signed and mailed.