How to Hide Duplicate Variations for Woocommerce Admin Menus

function plt_hide_duplicate_variations_for_woocommerce_menus() {
	//Hide "Duplicate variation".
	remove_menu_page('duplicate-variations-smg');
	//Hide "Duplicate variation → Duplicate variation".
	remove_submenu_page('duplicate-variations-smg', 'duplicate-variations-smg');
	//Hide "Duplicate variation → Contact Us".
	remove_submenu_page('duplicate-variations-smg', 'duplicate-variations-smg-contact');
	//Hide "Duplicate variation → Upgrade".
	remove_submenu_page('duplicate-variations-smg', 'duplicate-variations-smg-pricing');
}

add_action('admin_menu', 'plt_hide_duplicate_variations_for_woocommerce_menus', 1000000000);

Where do I put this code?