Edit: do no longer forget that each and every cellular in column A ought to evaluate against each cellular in column B to verify if there is not any tournament. So.... you will in fact be processing: seventy 3,764 cells each and every against seventy 3,864 cells or 5,448,504,096 computations ( confident, 5 BILLION). If it stops responding each and every time you call it, it ought to easily be too plenty for Excel to attend to (or a awful macro :) end edit: ============== ok... we will supply it yet another go. attempt this macro. replica the macro to the clipboard: Sub Append_and_Reset() Dim i, LastRowA, LastRowB, dMarc LastRowA = variety("A" & Rows.count variety).end(xlUp).Row LastRowB = variety("B" & Rows.count variety).end(xlUp).Row application.ScreenUpdating = fake For i = LastRowA to a million Step -a million If application.CountIf(variety("B:B"), Cells(i, "A")) = 0 Then Cells(i, "A").replica variety("A" & LastRowA).Offset(a million, 0).pick ActiveSheet.Paste Cells(i, "A").Delete end If next For i = LastRowB to a million Step -a million If application.CountIf(variety("A:A"), Cells(i, "B")) = 0 Then Cells(i, "B").replica variety("B" & LastRowB).Offset(a million, 0).pick ActiveSheet.Paste Cells(i, "B").Delete end If next For i = a million To LastRowA If application.CountIf(variety("B:B"), Cells(i, "A")) = 0 Then dMarc = Cells(i, "A").Row go out For end If next For i = a million To dMarc - a million Cells(i, "B").cost = Cells(i, "A").cost next end Sub Press ALT + F11 interior the menus on the suitable of the VBE, pick INSERT > MODULE Paste the macro into the module modifying section to the excellent. close the VBE and return to Excel. Press ALT + F8 while the Macros window opens, spotlight this macro and click 'suggestions..' enter a letter for use as a keyboard shortcut and click 'ok'. close the Macros window. Press CTRL + your letter to run the macro. be conscious: this macro has been examined with distinctive archives gadgets and applications as your question states it is going to to return the needed result. whether, in case you like to backup your archives first, please gain this.