Italian Club u23

I am thinking about starting a save in the Serie A, most probably AC Milan, but an important part of this would be the ability to set up an U23 side. Juventus U23 are in the game but I was unable to find information about how registering a new U23 side would work. Is there anybody that can advise whether this is actually possible and if so how it works/how long it took to be able to register the U23 team.

thanks