How to modify a surface by designating the heights of any arbitary points on the surface?

[Ncik]

WIP stands to Work In Progress…Rhino WIP will eventually turn into Rhino V6.

Should be able to get a copy from here…

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Regarding your specific question about modifying a surface, a better approach in Rhino is to create curves that fit the points you desire then fit a surface to the curves. If you have a lot of this to do, it might be best to invest some time researching Grasshopper. It is a plugin for rhino that gives parametric-like features.

Grasshopper