once you attach a sample workbook (see forum rules - how) , it will be easier to understand the real layout
Basically it looks that to do it effectively you need a simple macro similar to this one:
could be that you need to check
rather than only Column C - but as I said - attachment is best way to show data layout.
The code is pretty simple, so shall be easy to adopt to ones needs.
In real life it is worth considering adding application.screenupdating=false in the code to speed things up.
See in attachment how it works on sample data.
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