Can you populate secondary dropdown choices in a webform?

I'm building a webform to facilitate stock control and wonder if there is a way to cut down on the values in the drop down menus.

Is it possible to use a [PARENT] value in a primary dropdown that populates [CHILDREN] in a second dropdown list?

Rather than listing all the children in the first instance, if it is possible to so it this way, I'd be glad of help.


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