[Koha] How to Installing Multiple Instances of Koha

Hi, I have install koha 18.11.4 live DVD successfully installed. I want to create three database in one KOHA sever because we have three college librarys in same campus. Is it possible to do that? The Live DVD almost Infield one database, " Database name 'library' port 80 OPAC and 8080 staff client. How to create More than tow database. Kindly tell & do needful.