(Please visit the site to view this file)You are right. Prima facie, "View.SelectGroup" function does not appear to be working the way it should. We will check this further. Also, please find below a macro in selecting a group of plates which uses the Geometry.SelectMultiplePlates function. However, the coding is very basic in the sense it expects the plates to be numbered sequentially and that you are not selecting more than 50 plates at a time. I have attached the excel sheet herewith.
Private Sub CommandButton1_Click()
Dim objOpenSTAAD As Object
Dim start_plate As Long
Dim end_plate As Long
Dim no_of_plates As Long
Dim count As Long
start_plate = Cells(1, 2).Value
end_plate = Cells(2, 2).Value
no_of_plates = 1 + (end_plate - start_plate)
Dim plateno(50) As Long
Set objOpenSTAAD = GetObject(, "StaadPro.OpenSTAAD")
For count = 1 To no_of_plates
plateno(count - 1) = start_plate + count - 1
Next
objOpenSTAAD.Geometry.SelectMultiplePlates plateno
Set objOpenSTAAD = Nothing
End Sub