fields workflow add more "Group Fields"

i have 3 texboxes which user fills with information about his education, what school he graduated etc. The thing is that he might have ended like 2 or more schools so i need a button which will copy these 3 texboxes and let user fill it again but with infos about other school, if he ended like third school he can click button once again and againg these 3 texboxes will appear.