Dependent Validation using Dynamic Arrays - KING OF EXCEL

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Wednesday, January 8, 2020

Dependent Validation using Dynamic Arrays

Dependent Validation using Dynamic Arrays

The Data Validation feature lets you choose from a dropdown list in Excel. It works great until someone wants to have two lists. The items in the second list are dependent on what is chosen in the first list. This is called dependent validation.
In the figure below, the items for the first dropdown list appear in D4#, thanks to =SORT(UNIQUE(B4:B23)). The validation in H3 points to =D4#. The list for the second validation appears in E4# because of the formula =SORT(FILTER(A4:A23,B4:B23=H3,"Choose Class First")). The validation in H5 uses =E4#.
The product database in A4:B23 lists products and classes. A UNIQUE formula in D4 gets the UNIQUE of class. The person using the worksheet choose from a validation dropdown in H3. The source of that first validation uses the Spiller notation of =D4#. Once they have chosed a Class, then E4 gets a list of matching products with =SORT(FILTER(A4:A23,B4:B23=H3,"Choose Class First")). A second validation drop-down for Product is in H5. The source for that list is =E4#.
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