Hi jmawea 
Try this code in Worksheet "Active"
Private Sub Worksheet_Change(ByVal Target As Range)
Dim LastRow As Long
If Not Intersect(Target, Range("D4:D76")) Is Nothing Then
If MsgBox("Do you want to move the line ?", vbQuestion + vbYesNo, "QUESTION ...") = vbYes Then
Application.EnableEvents = False
Range("B" & Target.Row).UnMerge
LastRow = Sheets("Completed").Range("D" & Rows.Count).End(xlUp).Row
Rows(Target.Row).Copy Destination:=Sheets("Completed").Range("A" & LastRow + 1)
Rows(Target.Row).Delete Shift:=xlUp
Application.EnableEvents = True
End If
End If
End Sub
A+
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