您需要注册自己的自定义帖子类型。我建议您将此添加到函数文件中，并根据需要进行调整，而不是试图弄清楚如何正确执行此操作（如其他答案所述）：

function custom_post_type() {

// Set UI labels for Custom Post Type
$labels = array(
    \'name\'                => _x( \'Staff\', \'Post Type General Name\' ),
    \'singular_name\'       => _x( \'Staff\', \'Post Type Singular Name\' ),
    \'menu_name\'           => __( \'Staff\' ),
    \'parent_item_colon\'   => __( \'Parent Staff\' ),
    \'all_items\'           => __( \'All Staff\' ),
    \'view_item\'           => __( \'View Staff\' ),
    \'add_new_item\'        => __( \'Add New Staff\' ),
    \'add_new\'             => __( \'Add New\' ),
    \'edit_item\'           => __( \'Edit Staff\' ),
    \'update_item\'         => __( \'Update Staff\' ),
    \'search_items\'        => __( \'Search Staff\' ),
    \'not_found\'           => __( \'Not Found\' ),
    \'not_found_in_trash\'  => __( \'Not found in Trash\' ),
);

$args = array(
    \'label\'               => __( \'staff\' ),
    \'description\'         => __( \'Staff List\'),
    \'labels\'              => $labels,
    // Features this CPT supports in Post Editor
    \'supports\'            => array( \'title\', \'author\', \'revisions\', \'author\', \'thumbnail\', \'excerpt\', \'revisions\', \'page-attributes\'),
    // You can associate this CPT with a taxonomy or custom taxonomy. 
    \'taxonomies\'          => array( \'category\' ),
    /* A hierarchical CPT is like Pages and can have
    * Parent and child items. A non-hierarchical CPT
    * is like Posts.
    */  
    \'hierarchical\'        => false,
    \'public\'              => true,
    \'show_ui\'             => true,
    \'menu_icon\'           => \'dashicons-businessman\',
    \'show_in_menu\'        => true,
    \'show_in_nav_menus\'   => true,
    \'show_in_admin_bar\'   => true,
    \'menu_position\'       => 5,
    \'can_export\'          => true,
    \'has_archive\'         => true,
    \'exclude_from_search\' => false,
    \'publicly_queryable\'  => true,
    \'capability_type\'     => \'page\',
);

// Registering your Custom Post Type
register_post_type( \'staff\', $args );
}
add_action( \'init\', \'custom_post_type\', 0 );

在wp admin中有一个很好的创建和编辑菜单项的插件。请在此处查看：

https://wordpress.org/plugins/admin-menu-editor/

对于在wordpress中生成内容的任何东西，都可以使用插件，这是一种很好的做法。将其直接编码为主题。

希望这有帮助！