you would need to create a 1040-X for 2014, then a 1040-X for 2015 and so on. how to do this in Turbotax is the question. in theory, neither Turbotax nor the IRS may no longer retain a copy of the 2014 return. don't know what Turbotax is going to permit. for example, 2014 is no longer supported by TT so how does one amend it.
contact Turbotax support. threads concerning amending 2014 are old.
5am-5pm Pacific Time (8-8 Eastern) Monday - Friday
https://support.turbotax.intuit.com/contact
800-446-8848
