Lookup values for dropdowns

I remember an announcement by Jotform (around last quarter of 2018)introducing a new feature that was related to being able to lookup values for a dropdown based on a keyword.  The lookup values were from another form/sheet/database.

Can you help me get more information on this feature?

I assume you're referring to Spreadsheet to Form Widget. Kindly check https://widgets.jotform.com/widget/spreadsheet_to_form

Here's the full instruction: https://www.jotform.com/help/442-How-to-Use-the-Spreadsheet-to-Form-Widget