Once you enable your iDevices products to work with the Google Assistant in the iDevices Connected app, you can immediately control individual products with your voice. By default, the Google Assistant recognizes the name given to the product during the setup process. Due to platform differences, rooms, services groups, and Android groups are not synced from the iDevices Connected app to Google Home.
To organize your products, the Google Home app offers "Rooms." Once products are added to the same room, they can be controlled together.
Add your Bedroom Dimmer Switch and Wall Outlets to a room called "bedroom." Then say, "Okay Google, turn on the bedroom," to turn on all the products within that room.
For more information on creating rooms, visit: https://support.google.com/googlenest/answer/7073578?hl=en