Drop down lists can greatly facilitate data entry. Learn how to use Microsoft Excel's data validation feature to create handy lists within your worksheets. Check out the article tutorial on how to add a drop down list to a cell in Excel https://www.techrepublic.com/blog/microsoft-office/how-to-add-a-drop-down-list-to-an-excel-cell/. For more Microsoft Excel tips, see https://www.techrepublic.com/article/excel-tips-every-user-should-master/.