I am trying to extrude a section and want the line to follow the existing profile. I create and start and end point and then try to create the middle point, but it keeps making that high pitched bong and won't complete. It worked fine on the other side.
While I'm at it, why can't I move this point? I try grabbing the point, the straight line, the curved line, nothing seems to really do it. I'm trying to keep the upper line aligned to the existing edge, the lower curve concentric to it, and the two pionts vertically aligned.
Well I assume you're using ST6 or earlier. And YES this has been a problem in those releases. However ST7 has made uge strides in improving "point control" to allow this to work as you desire. Watch here: http://screencast.com/t/DGTRT4J6nEz
But in your specific case I would use the "Include" (Project to Sketch) command to grab all the exiting lines needed.