When you're on the business income and expense summary screen, click on Add expenses for this work under Expenses.
TurboTax will recommend some common expense categories based on the information you've entered about your business so far. If repairs and maintenance expense is not listed there, scroll down to the Less Common section.
You can page through the various expenses (they should be in alphabetical order), or you can type Repairs in the search bar. When you see the expense category, select the check box next to it and then click Continue.
