Excel Questions

Hey guys,

So I'm an I.T. guy that's new to Excel. I know just enough about it to get myself in trouble. I have a simple Excel spread sheet that I have but together, basically long story short, I need to be able to do this: I want to take one column and take the sum of a cell below another cell and display the difference in that cell, if that makes sense. I need to carry that formula all the way down the work sheet, very simple formula, just didn't know how to say "continue this all the way down this column."

Thanks,

riders36