How to Hide Quick Product Importer Admin Menus

function plt_hide_quick_product_importer_menus() {
	//Hide the "Quick Importer" menu.
	remove_menu_page('quick-product-importer');
	//Hide the "Quick Importer → Quick Importer" menu.
	remove_submenu_page('quick-product-importer', 'quick-product-importer');
	//Hide the "Quick Importer → Settings" menu.
	remove_submenu_page('quick-product-importer', 'quick-product-importer-settings');
}

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

Where do I put this code?