I have an issue where I'm trying to summarize customer data by product. The data I receive (sheet 1) contains the product, metric and customer by month. I need to summarize this data using data validation, allowing for the month and metric (in this example Sales $ and quantity) to be changed by the user. This screams of a sumif formula but the column to look up will change based on the selected month. I'm unsure how to make a formula work and was hoping for a hint or two from you experts.
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