[Steven Zahm]

@ Seun Tayo

Yes, that is correct. The full code would be like this to add three fields:

// Register the metabox and fields.
add_action( 'cn_metabox', 'cn_register_custom_metabox_and_text_field' );

function cn_register_custom_metabox_and_text_field() {

    $atts = array(
        'title'    => 'Metabox Name',         // Change this to a name which applies to your project.
        'id'       => 'custom_one',           // Change this so it is unique to you project.
        'context'  => 'normal',
        'priority' => 'core',
        'fields'   => array(
            array(
                'name'       => 'Field Name', // Change this field name to something which applies to you project.
                'show_label' => TRUE,         // Whether or not to display the 'name'. Changing it to false will suppress the name.
                'id'         => 'field_id',   // Change this so it is unique to you project. Each field id MUST be unique.
                'type'       => 'text',       // This is the field type being added.
                'size'       => 'regular',    // This can be changed to one of the following: 'small', 'regular', 'large'
            ),
            array(
                'name'       => 'Field Name', // Change this field name to something which applies to you project.
                'show_label' => TRUE,         // Whether or not to display the 'name'. Changing it to false will suppress the name.
                'id'         => 'field_id',   // Change this so it is unique to you project. Each field id MUST be unique.
                'type'       => 'text',       // This is the field type being added.
                'size'       => 'regular',    // This can be changed to one of the following: 'small', 'regular', 'large'
            ),
            array(
                'name'       => 'Field Name', // Change this field name to something which applies to you project.
                'show_label' => TRUE,         // Whether or not to display the 'name'. Changing it to false will suppress the name.
                'id'         => 'field_id',   // Change this so it is unique to you project. Each field id MUST be unique.
                'type'       => 'text',       // This is the field type being added.
                'size'       => 'regular',    // This can be changed to one of the following: 'small', 'regular', 'large'
            ),
        ),
    );

    cnMetaboxAPI::add( $atts );
}

Hope that helps!