Thanks for creating the thread - it's a great question and a problem that virtually every GM dealer will have to solve.
While I wish I had a great answer for you, I don't. Part of me thinks it might be easiest to track the parts orders and subsequent arrivals via a spreadsheet. I know it's more work for your staff but I can't think of any easier option.
Hopefully someone with more knowledge or a better idea will chime in.
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