states : region of france
i would like create a field with regions of france. I know do that but when you selected a région, you want to have a new field with a listing of département.
first: i create a field with checkbox with regions Alsace, Aquitaine, Auvergne, Basse-Normandie, Bourgogne, Bretagne, Centre, Champagne-Ardenne, Corse, Franche-Comté, Haute-Normandie, .........
but what must i do after for when i choose a region i have the departement's listing of this region?