One way is to have the combo box look at a separate Word document which you
could maintain.  When the UserForm Initializes it goes out to your separate
Word document and gets the necessary information.

Here is some information that will help you build a client list type
document - once you see how it works, you can then adapt it to fit your
needs, you will need to modify the code to tell it where you have your
source document containing your information such as c:\Documents and
Settings\John\Desktop\My Clients.doc:

This routine loads a listbox (or a combobox) with client details stored in a
table in a separate document (which makes it easy to maintain with
additions, deletions etc.), that document being saved as Clients.Doc for the
following code.

On the UserForm, have a list box (ListBox1) and a Command Button
(CommandButton1) and use the following code in the UserForm_Initialize() and
the CommandButton1_Click() routines

Private Sub UserForm_Initialize()

Dim sourcedoc As Document, i As Integer, j As Integer, myitem As Range, m As
Long, n As Long

' Modify the path in the following line so that it matches where you saved
Suppliers.doc

Application.ScreenUpdating = False

' Open the file containing the client details

Set sourcedoc = Documents.Open(FileName:="e:\worddocs\Clients.doc")

' Get the number or clients = number of rows in the table of client details
less one

i = sourcedoc.Tables(1).Rows.Count - 1

' Get the number of columns in the table of client details

j = sourcedoc.Tables(1).Columns.Count

' Set the number of columns in the Listbox to match

' the number of columns in the table of client details

ListBox1.ColumnCount = j

' Define an array to be loaded with the client data

Dim MyArray() As Variant

'Load client data into MyArray

ReDim MyArray(i, j)

For n = 0 To j - 1

For m = 0 To i - 1

Set myitem = sourcedoc.Tables(1).Cell(m + 2, n + 1).Range

myitem.End = myitem.End - 1

MyArray(m, n) = myitem.Text

Next m

Next n

' Load data into ListBox1

ListBox1.List() = MyArray

' Close the file containing the client details

   sourcedoc.Close SaveChanges:=wdDoNotSaveChanges

End Sub

Private Sub CommandButton1_Click()

Dim i As Integer, Addressee As String

Addressee = ""

For i = 1 To ListBox1.ColumnCount

   ListBox1.BoundColumn = i

   Addressee = Addressee & ListBox1.Value & vbCr

Next i

ActiveDocument.Bookmarks("Addressee").Range.InsertAfter Addressee

UserForm.Hide

End Sub

The Initialize statement will populate the listbox with the data from the
table and then when a client is selected in from the list and the command
button is clicked, the information for that client will be inserted into a
bookmark in the document.  You may want to vary the manner in which it is
inserted to suit your exact requirements, but hopefully this will get you
started.

To make it easy for you, the code has been written so that it will deal with
any number of clients and any number of details about each client.  It
assumes that the first row of the table containing the client details is a
header row

(My Thanks to Greg Chapman for this example.)