As you can see the , the column under "Aep cost" contains an if statement that matches the month to the month entered in C2 to extract values from "total bill" for the relevant bill. But I lose the values when the month in C2 is changed. I need to record the values into the L column in such a way that they retain those values and don't go back to 0 when the if statement under "aep cost" is not satisfied. They only change if the "total bill" amount changes. I hope the question is clear.
