Without question among the most compelling characteristics of Autodesk Civil 3D are the dynamic relationships.
Examples of this behavior are changes that occur to points automatically causing changes to surfaces built from the points, causing changes to contours based on the surfaces, and causing changes to profiles sampled from surfaces along alignments. Another example would be when an alignment is modified (this can occur by simply drag and drop), Stationing can be automatically updated and profiles would resample at the new location of the alignment.
The new processes eliminate the need for users to have to manually run the steps to make sure changes to one type of data are reflected in other data. This also eliminates the possiblilty of using out of date data.