You could use a formula and helper column
A1 contains "this is"
In C1 enter this formula =A1 & " " B1 Note: the " " adds a space.
In B1 type "combined text"
C1 will return "this is combined text"
To have it happen without a formula you would need VBA event code.
Private Sub Worksheet_Change(ByVal Target As Range)
On Error GoTo endit
If Target.Column = 2 Then
Application.EnableEvents = False
With Target
.Value = .Offset(0, -1).Value & " " & .Value
End With
End If
endit:
Application.EnableEvents = True
End Sub
When you type text in column B then hit enter, that text will be prefaced by the
text in Column A
This is sheet event code. Right-click on the sheet tab and "View Code"
Copy/paste into that sheet module. Alt + q to go back to Excel window.
Gord Dibben MS Excel MVP