You enter the total of all *previous* years contributions that you had not *already* withdrawn. Any "this year" (I assume you mean 2017 contributions) you do not enter, you enter those in the IRA contribution interview as 2017 contributions. TurboTax will combine the prior year contributions with the 2017 contribution for you and report it correctly on a 8606 form.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
