functions.php

<?php

// create post type
add_action( 'init', 'create_post_type' );
function create_post_type() {

	$conf = array(
		'public' => true,
		'has_archive' => true,
		'menu_position' => 5,
		'show_in_nav_menus' => true,
		'hierarchical' => true,
		'has_archive' => true,
		'supports' => array('title', 'editor', 'content', 'page-attributes'),
		'taxonomies' => array('category', 'post_tag'),

		);

	$conf['labels'] = array(
		'name' => __( 'Architecte Posts' ),
		'singular_name' => __( 'Architecte' )
		);
	$conf['rewrite'] = array('slug' => 'architect');

	register_post_type( 'architect_subpage',$conf);


	$conf['labels'] = array(
		'name' => __( 'Interior Posts' ),
		'singular_name' => __( 'Interior' )
		);
	$conf['rewrite'] = array('slug' => 'interior');
	register_post_type( 'interior_subpage',$conf);
}

// remove posts menu since it's not in use
function remove_menus () {
	global $menu;
	$restricted = array(__('Posts'));
	end ($menu);
	while (prev($menu)){
		$value = explode(' ',$menu[key($menu)][0]);
		if(in_array($value[0] != NULL?$value[0]:"" , $restricted)){unset($menu[key($menu)]);}
	}
}
add_action('admin_menu', 'remove_menus');




/* Define the custom box */
add_action( 'add_meta_boxes', 'wpse_61041_add_custom_box' );

/* Do something with the data entered */
add_action( 'save_post', 'wpse_61041_save_postdata' );

/* Adds a box to the main column on the Post and Page edit screens */
function wpse_61041_add_custom_box() {
    add_meta_box(
        'wpse_61041_sectionid',
        'Publish in Menu',
        'wpse_61041_inner_custom_box',
        'architect_subpage',
        'side',
        'high'
    );
}

/* Prints the box content */
function wpse_61041_inner_custom_box($post)
{
    // Use nonce for verification
    wp_nonce_field( 'wpse_61041_wpse_61041_field_nonce', 'wpse_61041_noncename' );

    // Get saved value, if none exists, "default" is selected
    $saved = get_post_meta( $post->ID, 'in_menu', true);
    if( !$saved )
        $saved = 'no';

    $fields = array(
        'yes'       => __('Yes', 'wpse'),
        'no'     => __('No', 'wpse'),
    );

    foreach($fields as $key => $label)
    {
        printf(
            '<input type="radio" name="in_menu" value="%1$s" id="in_menu[%1$s]" %3$s />'.
            '<label for="in_menu[%1$s]"> %2$s ' .
            '</label><br>',
            esc_attr($key),
            esc_html($label),
            checked($saved, $key, false)
        );
    }
}

/* When the post is saved, saves our custom data */
function wpse_61041_save_postdata( $post_id )
{
      // verify if this is an auto save routine.
      // If it is our form has not been submitted, so we dont want to do anything
      if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
          return;

      // verify this came from the our screen and with proper authorization,
      // because save_post can be triggered at other times
      if ( !wp_verify_nonce( $_POST['wpse_61041_noncename'], 'wpse_61041_wpse_61041_field_nonce' ) )
          return;

      if ( isset($_POST['in_menu']) && $_POST['in_menu'] != "" ){

            update_post_meta( $post_id, 'in_menu', $_POST['in_menu'] );

      }
}