How to Hide Cost Calculator Builder Admin Menus

function plt_hide_cost_calculator_builder_menus() {
	//Hide "Cost Calculator".
	remove_menu_page('cost_calculator_builder');
	//Hide "Cost Calculator → Calculators".
	remove_submenu_page('cost_calculator_builder', 'cost_calculator_builder');
	//Hide "Cost Calculator → Templates".
	remove_submenu_page('cost_calculator_builder', 'cost_calculator_templates');
	//Hide "Cost Calculator → Settings".
	remove_submenu_page('cost_calculator_builder', 'cost_calculator_builder&tab=settings');
	//Hide "Cost Calculator → Orders".
	remove_submenu_page('cost_calculator_builder', 'cost_calculator_orders');
	//Hide "Cost Calculator → Upgrade".
	remove_submenu_page('cost_calculator_builder', 'cost_calculator_gopro');
	//Hide "Cost Calculator → Pro Features".
	remove_submenu_page('cost_calculator_builder', 'cost_calculator_pro_features');
}

add_action('admin_menu', 'plt_hide_cost_calculator_builder_menus', 21);

Where do I put this code?