Within Active Directory I have several Organizational units each with their own GPOs. Basically if the top level has a policy set(e.g. security) should that be then inherited to all child objects unless it is over ridden. So as long as I don't configure it differently it will use it.
Also, is there anyway to check how big the GPO is? I don't know if that's a stupid question, but our laptops seem to take ages to log on and I'm trying to figure out why.