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// ----------------------------------
// --  REMOVE LEFT NAV MENU ITEMS  --
// ----------------------------------
 
function pc_remove_links_menu() {
 
     global $menu;
 
     remove_menu_page('upload.php'); // Media
     remove_menu_page('link-manager.php'); // Links
     remove_menu_page('edit-comments.php'); // Comments
     remove_menu_page('plugins.php'); // Plugins
     remove_menu_page('options-general.php'); // Settings
     remove_menu_page('tools.php'); // Tools
}
 
add_action( 'admin_menu', 'pc_remove_links_menu' );
 
// ----------------------------
// --  REMOVE NAV SUB MENUS  --
// ----------------------------
 
function pc_remove_submenus() {
 
  global $submenu;
 
  unset($submenu['index.php'][10]); // Removes 'Updates'.
  unset($submenu['themes.php'][5]); // Removes 'Themes'.
  unset($submenu['options-general.php'][15]); // Removes 'Writing'.
  unset($submenu['options-general.php'][25]); // Removes 'Discussion'.
  unset($submenu['edit.php'][16]); // Removes 'Tags'.
  unset($submenu['edit.php'][15]); // Remove 'Categories'.
  unset($submenu['tools.php'][5]); // Removes 'Available Tools'.
  unset($submenu['tools.php'][10]); // Removes 'Import'.
  unset($submenu['tools.php'][15]); // Removes 'Export'.
  unset($submenu['tools.php'][25]); // Removes 'Delete Site'.
  unset($submenu['users.php'][10]); // Removes 'Add new user'.
  unset($submenu['users.php'][5]); // Removes 'All Users'.
}
 
add_action( 'admin_menu', 'pc_remove_submenus' );