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Forget INDIRECT: The modern way to create cascading drop-down lists in Excel

Use dynamic arrays and tables for fast, scalable cascading drop-down lists in modern Excel.

Create Dynamic Excel Data Validation Lists Using Table Spill Ranges

Excel validation lists avoid blanks and errors with TOCOL(ignore) plus FILTER; the spill range stays stable across worksheets.
Geeky Gadgets

Building Excel data entry forms without using Visual Basic (VBA)

If you are looking to build data entry forms for Microsoft Excel but don’t have any Visual Basic for Applications (VBA) skills. You will be pleased to know that there is an easy workaround that allows ...
PC World

Excel: How to create simple and dependent drop-down lists

Drop-down lists in Microsoft Excel (and Word and Access) allow you to create a list of valid choices that you or others can select for a given field. This is especially useful for fields that require ...