Code and button is in sheet 8, would like to alter code to run from sheet 13. Thanks,

Sub Button1_Update()


Range("E2").Value = Range("E2").Value + Range("N2").Value
Range("E3").Value = Range("E3").Value + Range("N3").Value
Range("E4").Value = Range("E4").Value + Range("N4").Value
Range("E5").Value = Range("E5").Value + Range("N5").Value
Range("E6").Value = Range("E6").Value + Range("N6").Value
Range("E7").Value = Range("E7").Value + Range("N7").Value
Range("E8").Value = Range("E8").Value + Range("N8").Value
Range("E9").Value = Range("E9").Value + Range("N9").Value
Range("E10").Value = Range("E10").Value + Range("N10").Value
Range("E11").Value = Range("E11").Value + Range("N11").Value
Range("E12").Value = Range("E12").Value + Range("N12").Value
Range("E13").Value = Range("E13").Value + Range("N13").Value
Range("E14").Value = Range("E14").Value + Range("N14").Value
Range("E15").Value = Range("E15").Value + Range("N15").Value
Range("E16").Value = Range("E16").Value + Range("N16").Value
Range("E17").Value = Range("E17").Value + Range("N17").Value
Range("E18").Value = Range("E18").Value + Range("N18").Value
Range("E19").Value = Range("E19").Value + Range("N19").Value
Range("E20").Value = Range("E20").Value + Range("N20").Value
Range("E21").Value = Range("E21").Value + Range("N21").Value
Range("E22").Value = Range("E22").Value + Range("N22").Value
Range("E23").Value = Range("E23").Value + Range("N23").Value
Range("E24").Value = Range("E24").Value + Range("N24").Value
Range("E25").Value = Range("E25").Value + Range("N25").Value
Range("E26").Value = Range("E26").Value + Range("N26").Value
Range("E27").Value = Range("E27").Value + Range("N27").Value
Range("E28").Value = Range("E28").Value + Range("N28").Value
Range("E29").Value = Range("E29").Value + Range("N29").Value



End Sub

Since your code doesn't reference a worksheet, it will run on the worksheet that has the button. Just copy the button to whatever sheet you want the code to run on.