I have a worksheet where I add every week a column with numbers. I insert a
new column for the new week and the next cell has a formula that sums only
the last four cells.

The thing is that when I insert the column, the sums stays refering to the
previous 4 and does not consider the new one. I need this sum to consider
ONLY the last 4 coulmns to te left of that, any ideas? Can you refer
dynamicaly to the previous 4 cells in order to sum them??

Thanks in advance,
Rds, from Argentina
Ignacio