How to Filter One Field By Another and Create Gravity Forms Chained Selects

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One of the most common uses for Populate Anything is creating Gravity Forms chained selects. For those unfamiliar, a chained select is when a series of choice-based fields are linked together so that the choices made in one field affect the available choices in the next field. Another term that describes this mechanic is filtering. Each drop down filters the next drop down so that only relevant results are displayed.

A familiar version of this is