The earnings included in the recharacterization, B, are not a contribution. The remaining amount that you can contribute is C = D - A = $6,500 - A.
Enter C as Total 2018 Traditional IRA Contributions. Amount A will already have been entered as Roth contribution subsequently recharacterized. As a result, TurboTax will show A + C on Form 8606 line 1 or on Schedule 1 line 32.
