Private Sub Worksheet_Change(ByVal Target As Excel.Range)
If Target.Column > 4 Then Exit Sub
On Error GoTo ErrHandler
Application.EnableEvents = False
Target.Formula = UCase(Target.Formula)
ErrHandler:
Application.EnableEvents = True
End Sub
As written Works on columns A only. Change the > 4 to a higher number for
more columns.
This is event code. Right-click on the sheet tab and "View Code".