Yamil:
You could start with one of the exterior street lamp objects (which is found under the Lamp Tool, for example
Street Lamp 01 12), then use the Roof Tool or an Object (
Solar Panel 12) to add the solar panel part to it. The simplest way to combine them would be to group them. It is also possible to save this group as a new object, see the Help Files and search for
Saving 3D Models as Objects, none of this involves GDL scripting.
HTH,
David