Hello Baxter,

Place this code in your ComboBox's After_Update event. This will add the vendor to list, but it is not permenant. You would need to store your vendor list on a worksheet or in a text file if you want to keep the changes to the list. If you have changed the name of the ComboBox from the default ComboBox1, be sure to make the change in the code also.
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Private Sub ComboBox1_AfterUpdate()

With ComboBox1
If .List(.ListIndex) = "Other" Then
NewVendor = InputBox("Enter Name of New Vendor Below.")
If NewVendor <> "" Then .AddItem NewVendor
.Text = NewVendor
End If
End With

End Sub
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Hope this helps,
Leith Ross