This Google SketchUp Tutorial article talk about using of Array command to Copy object.
Array command on Google SketchUp commonly found in technical drawing software such as AutoCAD and other CAD software. Array command functions similar to the Copy command, similarly to duplicate objects.
Use with the Move tool in combination with the Ctrl (Control) and add command parameters are more clearly seen in the Youtube video tutorial below. Note the addition of parameters to use this command in the command area (red box like the picture beside).
Related Google SketchUp Tutorial: