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hi Nicola JOnes1
Sorry my reply was a bit late.
With your description, I tested the features you need on excel. Relying solely on function formulas in Excel may not achieve the function you need. Your functionality may need to be implemented via VBA.
I would very much like to help you, but there are issues with VBA code that are beyond the support of the forum. Therefore, I may not be able to give you more effective advice.
It is more suitable for publishing on Microsoft Learn, you can click on "Ask a question", there are experts who can provide more professional solutions in that place. Here is a link to the forum where you can raise specific scenarios and share your idea to help solve the problem. Excel - Microsoft Q&AI won't be able to help you, but I'll leave that question open in case one of our amazing volunteers has ideas for you.
Thank you for your patience and understanding.
Best Regards,
LucyW-MSFT | Microsoft Community Support Specialist