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My data file contains product numbers and sales over monthly buckets. The First month of sale is different for different products. There are also months when no sale happened for a particular product. For my analysis I want all the months prior to the first sale month of a product to be null() and all the empty cells after the first sale to be zero.
I am not sure how to do this, is there an easier way to do? The attached excel file will give you a clear picture.