Create a Cascading Category Selector

[RobertZitowsky1]

Hello, I need to create a cascading category selector. The first category selector is County. The second category selector is Municipality. When the user selects a County, the Municipality selector displays only  those municipalities within the selected county. 

[BruceHarold]

Where does this need to be available?  Does contingent values functionality do the job for you?

[jcarlson]

If your County selector is based on Features, you can have it filter the Municipality layer by spatial relationship. Or if the municipalities have a County attribute, you can do an attribute-based filter instead. Any category selector can filter any other category filter.