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Seems simple enough.  I have a packaging render I am doing with several artwork variations.  Each variation consists of a group of layers, some text, some linked, etc.  I want to run a new artwork variation by simply duplicating an existing group/variation.  My challenge is that every time I change a link in the duplicate layer, it changes the same layer in the parent group.  Which seems like insane default functionality to me, but I also believe that aliens obviously exist, so my judgement may be off.  Hopefully someone here can lend a hand.  My sanity hangs in the balance...