Adding Google Chrome Custom Search Engines

I need to add our domain with a https://%s.ourdomain.com to everyone's Chrome.app/saerch engines on their machines but I am getting nowhere. I have heard mention of a Managed Preferences file, but cannot locate it. I have no Default folder in the $PATH. I have tried adding the domain with a snapshot but when it deploys Chrome acknowledges that settings changes were made, and reverts them. THis is annoying and should be easy. HELP!