Since sample line geometry controls where surfaces are sampled to create section objects, sample lines are the parent of the section object.
You create one or more section views along a sample line to graphically represent section objects at that location across an alignment. Thus, each section and section view are children of a sample line. Each sample line is associated with a sample line group, which is in turn associated with an alignment.
Profiles are longitudinal sections cut along a linear feature and are also children of the parent alignment.