Kubla Cubed User Manual
When defining bulk earthworks, it is possible to utilise all the element types to create the proposed topography, or it is possible to use just use one. The definition of bulk earthworks elevations usually requires quite a bit more thought and planning than, for instance, the existing, strip or demolition phases which can be quite straight forward.
In regard to the best approach, it often depends on what data you have in your site plan. If you have a set of contour lines defining smooth terrain, it would be best to use a 'Feature Surface' and use contour lines. However, if you have a series of terraced areas, then a number of platforms might be appropriate. For a warehouse foundation, with a number of ramps you could use some platforms and slope elements or define the whole thing in a 'Feature Surface' with break-lines.