I assume you don't want the spaces having a strikethrough.
A macro or event code can find the spaces and ignore them.
Macro..............
Sub strike_through()
'Strikethrough ignore spaces
Dim v As Variant, i As Integer
Dim cel As Range
For Each cel In Selection
If cel.HasFormula = False Then
v = cel.Value
For i = 1 To Len(v)
If Not (Mid(v, i, 1)) = Chr(32) Then
cel.Characters(Start:=i, _
Length:=1).Font.Strikethrough = True
End If
Next i
End If
Next cel
End Sub
Gord Dibben MS Excel MVP