To create a drop-down list, select cell where you want it to be (in this case, cell I2), and in the Data tab on the ribbon, click "Data Validation" in the drop-down option with the same name.

Learn how to ensure accurate data entry in Excel by creating drop-down lists for consistency in your spreadsheets with the help of this guide ...

TL;DR Key Takeaways : Multi-level dependent drop-down lists in Excel streamline data entry by allowing each list to depend on the previous selection, reducing errors and enhancing data management.