I need to set up a column that will keep a running total of values. I have a program that automatically sets values for the columns in SharePoint. The program will overwrite the previous value within that column and I need a way of keeping a total from the previous and most up to date values.
I was thinking of setting up a calculated column that sums itself with the value of the updated column.
Is this possible with a calculated column? Would a workflow give me the capabilites I need?