3d Spline Intersections Problem

[larrytech10]

I am trying to connect 3d splines to each other in AutoCAD 2009. Now, one of the splines is within a single plane and the other spline intersects that plane (not the spline). I'll attach some screenshots.

As you can hopefully see, there is one spline (I'll call it S1) in the xy plane. Then there are a series of splines (I'll call these Si) perpendicular to that plane. I am trying to connect the Si splines to the S1 spline by moving the last blue node VERTICALLY ONLY.

I've tried using OSNAPS to snap to S1 spline, but the only "snap" that links the two splines has been the "perpendicular" snap. Since the S1 spline is curvilinear, the perpendicular intersection changes horizontally. I do not want this. I only want to adjust the spline in the z-direction, VERTICALLY ONLY.

Does all of this make sense? Is there a way to intersect these splines?

[JD Mather]

I noticed that you are using educational version.

Students can download Autodesk Inventor Professional for free from http://www.autodesk.com/edcommunity

If you really want to do this in AutoCAD attach your dwg file here.

[duhvinci]

Try using point filters. Before selecting the perpendicular point on the planular spline at the prompt type in ".z" then the perpendicular snap point on the spline. After you select that snap point you will be left with the prompt "x, y of" now select the node of the spline you wish to move.