Google Tag Manager is a great way to manage and control all google scripts in one location.
Before you get started, sign up for your free tag manager account.
Within the Setup Account page, add your account name (eg. your company name).
Agree with the the terms of service.
Now navigate to the Neto dashboard and go to Setup & Tools > All settings & tools.
Click on Analytics & 3rd Party Scripts tab and click Custom Scripts.
Click the Add New button.
Name the script Google Tag Manager.