Did you have a look at VI Scripting? If not, check the following example - [LabVIEW]\examples\Application Control\VI Scripting\Creating Objects\Adding Objects.vi To be able to create controls or indicators you should open the BD and change VI server class for "Function" constant to Generic -> GObject -> GObject. Then you change "Subtract" constant to something like "Numeric Control" and run the VI.
Hope, this will help you move further with your task.