Running total in Table
This works because, the INDEX function returns a reference to the first cell, not the actual value. The result is a reference that expands. The SUM function sums the values in the range at each row, creating a running total. Simple expanding range Why not use a simpleexpanding rangelike this? For some reason, this kind of mixed reference becomes corrupted in an Excel Table as rows are added. Using INDEX with a structured reference solves the problem....