Questions About Directory Structure for Site/Admin

Hi,

I'm searching some information about directory structure. I'm try to explain what i need. 
On the documentation, https://codeigniter.com/user_guide/gener..._apps.html
I can change my app folder to my projectname. I already did this.
Lets assume our project name and address is "qua.com"

qua.com/site
qua.com/admin
qua.com/manager

Each page must be different directory. For example, on root directory i created new folder which name is "thirdparty" and i create 3 sub directory "site, admin, manager" and each directory has Config, Controller, Databases, Helpers,Views. etc. (this files already created in app directory)

Is it possible? Any guide for that ?  
Thanks,

solved that it's very easy when you are using autoload.