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You can insert the selected option of a drop down in a text box, but only if you are using the normal drop down field as well as the normal text box field :
You can doing it using conditions : http://www.jotform.com/help/286-How-to-Populate-Field-with-a-Value-from-another-Field
But you can not send values to a Narrative Fields widget nor to the Configurable List Widget.
Let us know if you need more help, we will be glad to assist you.
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