adams, thanks, but I guess I wasn't specific enough in my question, because your suggestion won't work for what I want to do (although, what you said will work

).
Mark R, thanks too, but that also won't work for what I need to do.
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I'll try to re-explain what I need to do. Basically, I need to be able to somehow be able to access the column to the left of the column that the formula is in.
Say I have a bunch of numbers in columns A and B. I'd want a formula to put in the cells in column C that would sum starting at column A, all the way up to the column to the left of the column the formula is in(in this case it's column C). Thus column C would have the sum of the data in columns A and B. Then I want to add another data column to the left of the column with the formula in it. I'd have data in columns A,B,C, and I'd want the forumla in column D (which was in C before it moved when I added the column) to sum columns A,B,C instead of just A,B without me having to change the formula.
Is this possible? I tried putting =sum(R[]C1:R[]C[-1]) in column C and that works fine, but it doesn't work when I add the new column and what was in column C becomes column D.
I hope that made more sense.
