Sub SortToBottom()
Dim lR As Long
'===========================================================
'(Specify the column index number to sort EG: Column E = 5)
Const SortColumn = 4
'(Specify the value to move to the bottom EG: "Unknown")
Const ValToMove = "Unknown"
'===========================================================
Application.ScreenUpdating = False
lR = Range("A" & Rows.Count).End(xlUp).Row
Columns("A:A").Insert
Range("A1:A" & lR).FormulaR1C1 = _
"=IF(RC[" & SortColumn & "]=""" & ValToMove & """,""ZZZ"",RC[" & SortColumn & "])"
Range("A1:A" & lR).Value = Range("A1:A" & lR).Value
Range("A1").CurrentRegion.Sort Range("A1"), xlAscending, Header:=xlYes
Columns("A:A").Delete Shift:=xlToLeft
Range("A1").Select
Application.ScreenUpdating = True
End Sub