How to Hide Client Power Tools Admin Menus

function plt_hide_client_power_tools_menus() {
	//Hide "Clients".
	remove_menu_page('cpt');
	//Hide "Clients → Clients".
	remove_submenu_page('cpt', 'cpt');
	//Hide "Clients → Messages".
	remove_submenu_page('cpt', 'cpt-messages');
	//Hide "Clients → Projects".
	remove_submenu_page('cpt', 'cpt-projects');
	//Hide "Clients → Project Types".
	remove_submenu_page('cpt', 'cpt-project-types');
	//Hide "Clients → Managers".
	remove_submenu_page('cpt', 'cpt-managers');
	//Hide "Clients → Settings".
	remove_submenu_page('cpt', 'cpt-settings');
}

add_action('admin_menu', 'plt_hide_client_power_tools_menus', 11);
Where do I put this code?