Get your taxes done using TurboTax

When I enter the amount in Box 11B, the amount does not reduce my taxes, and I am subsequently told by TT that I need to specify exactly what the deduction is for. It says to "search the topic," and then enter the number in that topic. That is completely meaningless. Where can you enter a Box 11B figure in order to get the amount entered on tax forms properly, and the deduction to take hold on your actual tax liability?