Add Site to Local Intranet Zone Group Policy

However how do you do this using group policy?

Simply perform the following actions:

Computer Configuration>Administrattive Templates>Windows Components>Internet Explorer>Internet Control Panel>Security Page...

Then here you can find the policy for "Site to Zone Assignment List"

You will need to enable it then add your url's right in there. Each zone assignment is going to have a numerical value. For entries into the trusted zone, use the value "2".

http://clintboessen.blogspot.com/2010/03/add-site-to-local-intranet-zone-group.html