CodeIgniter: Validate form with multidimensional POST data

So the framework is CodeIgniter 2.0.2. I have a form that has groups of fields that correspond to rows in a database. The names of the fields are in the format:

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I'm creating an e-commerce site using CodeIgniter .

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public function dcr() {

    $query = $this->db->query("SELECT * FROM church_repo");

    foreach ($query->result() as $row) {

        $data = array('churchName'           => $row->church_name,

                      'streetAddress'       => $row->street_address,

                      'locationalState'     => $row->locational_state,

                      'locationalZIP'       => $row->locational_zip,

                      'locationalCountry'   => $row->locational_country,

                      'locationalCity'      => $row->locational_city,

                      'overseerAccountId'   => $row->overseer_account_id,

                      'taxExemptionNumber'  => $row->tax_exemption_number,

                      'accountStatus'       => $row->status,

                      );

        $this->load->view('admin-request', $data);

    }

}

Do I need to write a custom session class for CodeIgniter?

I cannot seem to get CI's session library to function the way I want it to. Essentially, I am storing 2 different categories of data within the sessions. The data within the 2 categories may contain the same value. Right now my attempt to add a key => value pair to the session is failing, as it is only allowing 1 key => value pair to be associated with the array. It overrides itself each time I do a post.

Keep form values after page reload - Codeigniter

How can I keep checkboxes selected after the form has been submitted? I found the set_checkbox function in the Codeigniter User Guide, but it doesn't work.