Hi mby,
Thanks for your reply.
So here is the question:
Sometimes you need to add a site for all the users.
And sometimes you need to add a site for certain departments.
Since it is the same setting, i don't think we can manage it at the the parent GPO and child GPOs at the same time.
There will be only one winning GPO. This is how the Group Policy works.
Best Regards,
Vicky