Yeah. It's an enormous macro that someone wrote that I'm now just coming into. Here is a section that I am trying to work with.

  'throughput normalize
    ActiveCell.FormulaR1C1 = "=RC[-1]-R" & row_num & "C[-1]"
    ActiveCell.Select
    Selection.AutoFill Destination:=ActiveCell.Range("A1:A10"), Type:= _
        xlFillDefault
    'end throughput
It is not within a loop. I know it may be way messy and complicated. Whoever made it just used the Record Macro, which is probably the noob way of doing anything.

Thanks again.