HI,
you can't do this natively, but there are still other ways to do this, here 2 examples (you can implement both or only one)

Client side method
You can add a simple javascript, when select field change then you update values of others fields.

Server side method
You can do this by writing a simple plugin, follow these instructions
- Download, Install and Enable our skeleton plugin (you will find at page http://docs.easy-profile.com/index.php/article/triggers)
- Open file /plugins/jsn/skeleton/skeleton.php
- Remove samples functions like triggerFieldAvatarUpdate and triggerProfileUpdate
- Add a function that do this:

public function triggerProfileUpdate($user,&$data,$changed,$isNew){

    if($data['council']=='council1')

    {

        $data['council_address']='address1.....';

        $data['council_fax']='123456788';

        $data['council_website']='http://xxxx.com';

    }

    if($data['council']=='council2')

    {

        ......

    }

    if($data['council']=='council3')

    {

        .....

    }

}

With this you fill Address,Fax an Website value based of another value.

NOTE 1: We not know your scenario, so we can't be more precise in suggest the most suitable solution or if exactly what you want is possible.
NOTE 2: This code is only for example purpose, not tested and not supported.