You can add expenses under the Dependent Care Credit section.
To enter childcare expenses not included on your w2 please follow the steps below:
From the TurboTax home screen, Locate and select Deductions and Credits
Scroll down and click +Add tax brakes
Locate the section You and your family, and select Dependent Care Credit. Click on Add (this will add it to your home screen list under deductions and credits).
Go back to Deductions and Credits and select Dependent Care Credit to edit. Enter pertaining information related to the additional care costs.