How to Hide HieCOR WooCommerce Plugin Admin Menus

function plt_hide_woo_corcrm_secure_payment_gateway_menus() {
	//Hide the "HieCOR Payments" menu.
	remove_menu_page('wc-settings&tab=checkout&section=corcrm_payment');
	//Hide the "HieCOR Payments → HieCOR Payments" menu.
	remove_submenu_page('wc-settings&tab=checkout&section=corcrm_payment', 'wc-settings&tab=checkout&section=corcrm_payment');
	//Hide the "HieCOR Payments → Bulk Post" menu.
	remove_submenu_page('wc-settings&tab=checkout&section=corcrm_payment', 'corcrm-bulkimport');
}

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

Where do I put this code?