Adding points and lines to 3D models with parametric surfaces

Hi all,

I was wondering if there is a way to add a point or line to a model in which I have a 3D block with the top surface replaced by a parametric surface derived from a DEM (digital elevation model).

I guess this can be done in either the geometry section so it is there for the entire model run, or in the results section under data sets.

The end result I am after is the displacements along a line that traverses the parametric surface or at a certain point on the parametric surface.

Any help in this matter would be greatly appreciated, and let me know if I haven't explained the problem sufficiently.

Thank in advance!

James.