Inserting a drop-down menu in Excel is a great way to streamline data entry. You can do this by selecting the cell where you want the drop-down, then going to 'Data' > 'Data Validation.' Choose 'List' and enter your options. Have you created drop-down menus before, or is this your first time? What kind of data are you working with in your spreadsheet? Let me know if you’d like more details!