Hey! Is it possible to change a a customised data field that i have created from a single option to a multiple option one?
I believe that you have to re-create the field as a multiple option-field.
@Pia Höglund unfortunately @Ville Väisänen is right. You can't convert it. You'd have to create a new field. You could potentially export your data in the old field and re-import it into the new one.