> Is this possible?  If so, could you provide an example:
> 
> I'm trying to find a way that when you do a search, that you can filter 
> entries using ( = , <>, AND) on one or more attributes.
> ex:  Find all workstations for this subnet, but exclude a particular one.
> Thats the basic idea.
> 
> Can it be done? If so, how?

No, it cannot be done right now, but it's on the wishlist since some time. 
So I added your vote there.