Is this what you mean?
Pierce
A sketch point and an axis, edge, line, or spline.
The sketch point is coincident to where the axis, edge, or curve pierces the sketch plane. The pierce relation is used in Sweeps with Guide Curves.
SW 2009 SP1.0
Dell Inc. Precision WorkStation 670
4096 Meg, Quadro FX 1400
Windows XP PRO SP3