AM4GoogleHome is an extension of AutomationOnDrive that allows the devices you have in AutomationManager to be used with Google Assistant.
After installing AutomationOnDrive and your AM devices have been discovered, use the menu item "Google Home" to subscribe to the AM4GoogleHome cloud service. There is a free trial period after which there is a small subscription charge to help pay for the cost of running the AM4GoogleHome cloud service on the google application cloud.
Use the extended menu to subscribe to the AM4GoogleHome service. Then choose the AM devices you wish to make available to Google Assistant and the type of device to represent (e.g. a switched device can be a plug or a light switch, a sensor could be a door, window, or motion sensor).
Once you have enabled AM4GoogleHome, open your Google Assistant (Home) app. Select "+", choose "Set up device", "Works with Google". Find "Automation Manager". Choose your AM location and link the service.
Your selected AM devices will now be available within Google Home for voice and remote access.
For more information see Google Home.