Creating a drop-down in Excel can make data entry more efficient. You can use Data Validation for this. First, select the cell where you want the drop-down. Then, go to the "Data" tab, click on "Data Validation," and choose "List." Enter the items you want in the drop-down, separated by commas or reference a range. Have you created drop-downs before, or is this your first time working with Excel's features? Let me know if you'd like more detailed steps!