Put this macro in the code module for Sheet1:
Private Sub Worksheet_Change(ByVal Target As Range)
Sheets("Sheet2").Cells(Target.Row, Target.Column) = Target
End Sub
and this macro in the code module for Sheet2:
Private Sub Worksheet_Change(ByVal Target As Range)
Sheets("Sheet1").Cells(Target.Row, Target.Column) = Target
End Sub
Keep in mind that as written, these macros will apply to all cells in the worksheets. If you want to limit this from happening to only certain cells, then I would need to know which cells you want to copy from one sheet to the next.
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