Sub SumColumns()
Dim Rng As Range
Dim Clms&, T&
Set Rng = Range("B2:F11")
Clms = Rng.Columns.Count
ReDim R(1 To Clms)
For T = 1 To Clms
s = Rng.Row
R(T) = Evaluate("SUM(Index(" & Rng.Address & ",," & T & "))")
Next T
Range("B" & Rng.Row + Rng.Rows.Count).Resize(1, Clms) = R
End Sub