Multi domain setting

[Umut Arus]

Hi,

I'm looking for multi domain setting to send domain part to some applications (for example g suite sub domain)

We are adding a sub domain like alumni.sabanciuniv.edu. Basic users login as us...@sabanciuniv.edu, alumni will login as  us...@alumni.sabanciuniv.edu 

We couldnt find a way. Do you know the setting in CAS?

Healthy days...