I have a workbook with 2 columns - the first is this days costs, the second
cost to date. The user needs to input data into todays costs that will then
auto update costs to date - this needs to happen for each entry on the
column.

Can anyone help? Have tried McGimpsey & Associates and the Worksheet
Function
Accumulator (using Circular References) but it doesn't work over several
rows. thanks for your help!