Hello everyone ! We want to make sure that students become involved in a class and not register by formation creates !! Let me explain : we would like to make classes available to students in the form of catalogs and allow them to choose the class they wish to register. Each class contains a number of formations. Once the student enrolled in a class he has access to all the formations of this class !! Please how to do this in opigno 2.0? Thank you in advance for your answers and help!