Conditional Serial Numbering

Hi, I'm trying to start a serial numbering sheet and having some trouble wrapping my head around how to make it work. I'd normally use the auto generated column but I only want the number sequence to increase if one of the columns has a status of Approved. Additionally, there are groupings that need to have their own separate serial number track.


It's easier to demonstrate the outcome I'm looking for than try to explain-


Thanks!

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