could we use a table of 2 columns to explain the calculation? ie first column specifies Range (eg column A, range A2:E5, etc) and second column gives commentaries (eg it calculates the inflated expenses for each projected periods etc) Is this advisable?
There is no one prescribed approach. The overriding objective is that your approach (whatever that is) is easy to follow and understand. Your stated approach would appear ok; however it’s difficult to be definitive without see the output.