What prompted this question? What are you ultimately trying to do?
If you bought a CD or download from Amazon, it will be provided by Amazon.
Plus, the Online and desktop (CD/download) versions of TurboTax also do not sync. They are completely separate products. So any desktop returns you've had in the past will not be seen in an online Tax Timeline.
That having been said, why are you asking? What is it you were hoping would "sync?" We may be able to tell you how to achieve your goal if you provide some details about your issue.
For instance, if you need to transfer 2015 data into a 2016 return, we can tell you how, no matter where it was purchased. If that's your issue, then what did you use for 2015--Online TurboTax or the desktop version? And what are you using for the 2016 return this year--the online version or the desktop version?
