Maybe this resource will help clarify it a little. http://wiki.holacracy.org/index.php?title=Policy
One thing to remember is that a Policy enacted on say the Anchor Circle would by necessity apply to the General Company Circle as the GCC, in the scope of the Anchor Circle, is one of it's roles (so that circle as a member role would have to abide by that policy). This would mean that the Policy would be defined on both the Anchor Circle, the GCC and inherited by any Sub-Circle there in by default (this is in some ways the reason to carefully consider the Organisations Anatomy/Structure). So essentially Policies have a cascading nature by default, you would need to stipulate specifically within the Policy Scope if it were to apply to the relevant Circle Only.