When you assign a new policy to a particular group of the Directory then all systems under that group with inheritance intact will inherit the new policy?

Yes, when a new policy is assigned to a specific group within a directory, all systems under that group will inherit the new policy as long as inheritance is enabled. This means that any settings or configurations defined in the policy will automatically apply to all systems within that group, simplifying management and ensuring consistency. If any systems have inheritance disabled, they will not receive the new policy.