Projecting sketch elements from 3d model to catdrawing?

Think you need to turn on to show wireframe, it's a property option for the view, or you set it as default in tools/options. Depending how the specification tree looks like there is also a possibility that the prevoius user multiselected bodies/sets when generating view, to limit what will be shown on the drawing view.

yes it is better that you enable it in:

Tools>options> Mech Design>Drafting>Views
check both Project 3D wireframe and points.
if you don't enable that then you'll always get the message that the part has nothing to project.

Hello,

I remeber having some problem with infinite line in sketches and projection in a CATDrawing.

If you have some issue, check inside the sketch for infinite line...