When you double-click a point on the
alignment in the tree or 3D area, the Alignment Point dialog box opens and the
point is highlighted automatically in the 3D area. You can choose the 3D Alignment on which the 3D alignment point is
positioned, its stationing, projection, and type. The picked position of
the 3D alignment point on the 3D alignment is considered as the initial
position when its stationing is defined.