Excel has plenty of flashy features, but few are as useful day after day as data validation. Drop-down lists were one of the first Excel features I learned that felt genuinely advanced, and I still ...

When I aggregated the data, the same department was split into four."General Affairs Department", "General Affairs", "General Affairs Department " (with a trailing space), and "Soumubu" (in katakana).

If you use simple copy and paste methods to duplicate an Excel drop-down list, you may discover a problem; when you copy a cell that has a drop-down list and press "Ctrl-V" to paste it into a new cell ...