You can only paste 3D graphics from a view into a scene. 2D graphics will be ignored. Only simple symbols can be used for point, line, and polygon features in 3D scenes. Color and size are the only properties used for points. Color and width are the only properties used for lines.
Color is the only property used for polygons.
All other properties will be ignored. In ArcView 3.0a, CAD based FThemes do not use z coordinates from the source data file in a 3D scene document. ArcView 3.1 will support z coordinates of CAD based FThemes. Only FThemes, GThemes, IThemes, and SThemes are supported in a 3D scene. Other theme types, such as DBThemes and StreetMap themes cannot be used.