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I don't know your version, starting from 9 it should be possible to do this via hierarchical groups without problems. In version 8 I see no chance for OOB.
The current version is 8.1.00, but we are in the process of upgrade to 9.1.04. I assume that you are referring to this:
I remember that there was something like creating a vendor/manufacture support groups when you need a third level support. I just do not know how much access rights they have.