Hey Community!
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.
Thanks so much!
