Private Sub CheckBox1_Click()
If CheckBox1.Value = True Then ActiveSheet.Range("A2").Value =
"Sheet2!$B$4"
If CheckBox1.Value = False Then ActiveSheet.Range("A2") = ""
End Sub


or

Private Sub CheckBox1_Click()
With CheckBox1
If .Value = True Then ActiveSheet.Range("A2").Value = "Sheet2!$B$4"
If .Value = False Then ActiveSheet.Range("A2") = ""
End With
End Sub


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