Thank you for your question below.
The only way to unassociate an object (regardless of whether it is a user, OU, Group or Organization) is to edit the objects ‘See Also’ property. You’ll see a reference to the configuration object. Removing this reference will unassociate the object from the configuration object.
We appreciate the lack of a ‘loop-back’ association mechanism cam make it difficult to identify associations between objects, and certainly makes it difficult (if not impossible) to remove the association programmatically. This is something we are looking at for a further release.
I hope this helps.