Easiest way is to go through and delete the objects you don't want.  You could do that through the GUI, or script it.   There is a re-initialize option in Unity but it will wipe the whole array.
Hello, I am looking for the simplest way to wipe my Unity array storage while keeping all my settings.  Basically blow away the storage pools, datastores etc while maintaining the network settings.   Thanks
Unity 300 storage reconfiguration