I have a bunch of solid models and surfaces that I'm importing into SW2010 from CATIAv5 as an iges.  I need to add some features onto the edges of these models.  I'm on task with this but when I select the edges of the models and convert them to 3DSketches, a number of gaps come up.  When I look closer to repair them, it seems like the model comes to a single point, but the converted sketch does not.  This poses a problem because I need a continuous path for many of the other operations.  Any thoughts?  Please help!