Iif you don't want to use a formula like ="w256 " & A1 copied down the column.
You could try a macro.
Sub Add_Text()
Dim cell As Range
Dim moretext As String
Dim thisrng As Range
On Error GoTo endit
whichside = InputBox("Left = 1 or Right =2")
Set thisrng = Range(ActiveCell.Address & "," & Selection.Address) _
.SpecialCells(xlCellTypeConstants, xlTextValues)
moretext = InputBox("Enter your Text")
If whichside = 1 Then
For Each cell In thisrng
cell.Value = moretext & cell.Value
Next
Else
For Each cell In thisrng
cell.Value = cell.Value & moretext
Next
End If
Exit Sub
endit:
MsgBox "only formulas in range"
End Sub
If you're not familiar with VBA and macros, see David McRitchie's site for
more on "getting started".
http://www.mvps.org/dmcritchie/excel/getstarted.htm
or Ron de De Bruin's site on where to store macros.
http://www.rondebruin.nl/code.htm
In the meantime..........
First...create a backup copy of your original workbook.
To create a General Module, hit ALT + F11 to open the Visual Basic Editor.
Hit CRTL + r to open Project Explorer.
Find your workbook/project and select it.
Right-click and Insert>Module. Paste the code in there. Save the
workbook and hit ALT + Q to return to your workbook.
Run or edit the macro by going to Tool>Macro>Macros.
You can also assign this macro to a button or a shortcut key combo.
Gord Dibben MS Excel MVP