I just downloaded and installed TurboTax 2024 Deluxe Fed and State to check this myself. My initial try in a Medical Expense box did work using Edit -> Add Supporting Details, and previous line items from 2023 were populated without amounts, as expected. The older "right click in box" to select Add Supporting Details did not work. I can live with that if it doesn't go intermittent as User kmh72756 reports (and as I experienced in previous years). I probably won't be able to exercise this more fully until tax time. Fingers crossed.
