@Tom-Elliott Another example:
You have a lab of 30 computers. 8 of them are Dell, 22 are Lenovo. You have an image that works on the dells, and an image that works on the Lenovos, but not an image for both yet.
You’d make three groups. ONe for the dells, one for the lenovos, and one for all 30 of them.
Use the dell group to apply the Dell image to all the dells. Use the Lenovo group to apply the Lenovo image to all the Lenovos. Use the bigger classroom group to apply Active Directory settings, Snapin Settings, Printer Settings, and whatever else.
Another example:
You have a building with 500 computers. 250 of them are Dell Optiplex 7010 models. The rest are other models. For this, you could have two or more groups. One group for all Optiplex 7010 models, and one group called “Blah-blah-Building” for every computer in the building. You’d use the building group to deploy updates for things like Chrome, and you’d use the model-specific group to do mass re-imaging when that time comes.