ok so i have a case_file which has many victims. it can also have many suspects and vice versa. how do i do that in yii so that whenever i view a case file, it will display all the victims and supects in it. im just new here so forgive me if my questions kinda dumb. thanks 
The question is too general and depends on the database design…
Design your database first.
Then use Gii and the rest usually follows.
You need a database schema first, so go ahead and design one.