Creating new restrictions on cameras that already contain restrictions
Since restrictions can be applied to individual cameras, cameras in the current view, and in camera groups, it is quite possible that new restrictions might be created on cameras that already contain restrictions.
Live restrictions
If a new live restriction is created on a camera that already contains a live restriction, the start time of the existing live restriction will be updated if the start time of the new live restriction is earlier than the start time of the existing live restriction.
If the start time of the new live restriction is the same or later than the start time of the existing live restriction, then the start time of the existing live restriction will not be changed.
Playback restrictions
Creating a new playback restriction on a camera that already contains a playback restriction will result in two playback restrictions for the same camera.
The scenarios described above only apply to creating new restrictions on cameras that already contain restrictions. You can always edit existing restrictions to change interval times as well as add or remove cameras.