To claim the Motor Vehicle Tax Adjustment in the West Virginia portion of TurboTax Online:
Open TurboTax Online
Select Tax Home in the left pane
Select the dropdown to the right of State Taxes
Select Review/Edit or Pick up where you left off
Proceed through the state interview until you get to the Motor Vehicle Property Tax Adjustment Credit screen
You'll be asked whether you received an MV-1 schedule from the West Virginia Tax Division. If you answer yes, the next screen will let you enter your MV-1 data. But when you answer no, you bypass the chance to enter that information.