function plt_hide_cms_blocks_menus() {
//Hide the "CMS Blocks" menu.
remove_menu_page('edit.php?post_type=cms-block');
//Hide the "CMS Blocks → All CMS Blocks" menu.
remove_submenu_page('edit.php?post_type=cms-block', 'edit.php?post_type=cms-block');
//Hide the "CMS Blocks → Add New CMS Block" menu.
remove_submenu_page('edit.php?post_type=cms-block', 'post-new.php?post_type=cms-block');
}
add_action('admin_menu', 'plt_hide_cms_blocks_menus', 15);