How to Hide PubyDoc - Data Tables and Charts Admin Menus

function plt_hide_pubydoc_data_tables_and_charts_menus() {
	//Hide "PubyDoc".
	remove_menu_page('pyt-tables');
	//Hide "PubyDoc → All Tables".
	remove_submenu_page('pyt-tables', 'admin.php?page=pyt-tables&tab=tables');
	//Hide "PubyDoc → Add Table".
	remove_submenu_page('pyt-tables', 'admin.php?page=pyt-tables&tab=tables-new');
	//Hide "PubyDoc → Diagrams".
	remove_submenu_page('pyt-tables', 'admin.php?page=pyt-tables&tab=diagrams');
	//Hide "PubyDoc → Settings".
	remove_submenu_page('pyt-tables', 'admin.php?page=pyt-tables&tab=settings');
}

add_action('admin_menu', 'plt_hide_pubydoc_data_tables_and_charts_menus', 11);

Where do I put this code?