While trying to remove a policy from the device group you can see the below warning:
"Cannot remove Policy from the device group. Try to override the Policy."
Symantec Endpoint Security cloud console.
The way the SES console works is:
There is no option to disable inheritance and you cannot remove a policy from a child group.
If you would like to use a different version of a policy than the parent one, you can directly apply a new policy to the child group. This will override the inherited policy.
Policy can be only removed at a root level except the core ones mentioned here.
The core policies can be only overridden by another policy of the same type.