Microsoft Excel's Data Validation tool lets you add a drop-down list to a cell based on existing data in a column. However, how this works depends on whether the source data is part of a formatted ...

When you work with Excel, you often need to ensure that the data entered into your spreadsheets is accurate and consistent. One effective way to achieve this is by using a drop-down list. In this ...

Automate repetitive data entry and fix broken sorting hierarchies using Excel's powerful, hidden Custom Lists tool.