I understand that you have created a DWG with a surface in Civil 3D and used CH1903 coordinate system. You want to add another point file data source, but this is in WGS84. You want to know if there is a way to transform the points during import.
If it is a point file you can load via the point tools you can apply a coordinate trasnformation during import, see attachment. See also the Civil 3D help files for more information :
Alternatively, it is possible to reproject the point file data via a FDO connection and a Data Query. A How To description can be found in the Map 3D Help or as an Article here :