original question:
i would to create VBA code that will bring up a dialogue box if the
words "TOOL ASSEMBLY" are input under column "F". I would like to
place certain words A, B, C, D whatever in a corresponding column on
the same row. Is this possible? any help is greatly appreciated,
thanks.

answer:
Option Compare Text
Private Sub Worksheet_Change(ByVal Target As Excel.Range)
'when entering data in a cell in Col F
On Error GoTo enditall
Application.EnableEvents = False
If Target.Cells.Column = 6 Then
n = Target.Row
If Excel.Range("F" & n).Value = "TOOL ASSEMBLY" Then
Excel.Range("G" & n).Value = "A, B, C, D or whatever"
End If
End If
enditall:
Application.EnableEvents = True
End Sub

this works great thanks. just one thing, is it possible to look for a
column heading such as "Name" instead of column "F", thanks again for
the help.