Using TurboTax Online, to change the answer to the question shown on line 34 of Schedule C, go to the Inventory section of your Schedule C (under expenses).
After you indicate that your business does have an inventory, the next page asks if you used the cost method to value your inventory. At the bottom of that page, there is a question with a check-box that says 'I used different methods to value my inventory at the beginning and end of 2023'. That is the question that toggles the answer on line 34 between 'yes' and 'no'.
When you check this box, the next page allows you to explain.
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