Here is the VBScript code:

Dim proj
Dim ProdConfig
Dim rel

' create the project
'Insert InstallShield version specific create object line here (See below)

' open the project file through the project object just created
proj.OpenProject ("C:\Test.ism")

' add a product configuration
Set ProdConfig = proj.AddProductConfig ("Version2")

' add a release
set rel = ProdConfig.AddRelease("TestBuild")

' Build the project
rel.Build()

' set objects to nothing to free memory

'proj.SaveProject();

'proj.CloseProject();

Set proj = Nothing
Set comp = Nothing

' indicate success
MsgBox "Completed Successfully"

Installshield 2014
Installshield 2013