Showing different fields based on the 'Enter your County' user input

If their county is on a list I provide... of 40 some counties, they get an extended form to fill out. If not they get a "Sorry" notification.

Has anyone  achieved something similar to this in JotForm?

Please take a look at the following scenario.

1) Add an Auto Complete field with a list of supported counties.

2) Add the "sorry" message based on a Text field.

3) Add a 'SHOW / HIDE FIELD' condition to show the sorry message when the county field value contains one of the unsupported counties. You will need to list unsupported county values separated by comma.

Result:

If you need any further assistance, please let us know.

I missed the part about extended form to fill out, so here is a possible solution.

4) Add a Form Collapse element with Visibility[Hidden] and Status[Open].

Extended fields should be under the Form Collapse element.

5) Add a 'SHOW / HIDE FIELD' condition to show the Form Collapse element when the county value contains one of supported counties.

Result: