Although a drawing will show a surface in wireframe, SolidWorks can not
render (shade) a part without "solid" geometry.
To work around this, you can simply create a
feature(Insert/Boss,Base/Thicken) with the surface and specify a sliver
thin .001" thickness, for example.
Per O. Hoel
I thought insert model items had an option to import surfaces & not just
dimensions? or were you talking about shading the drawing view & the
surfaces do not shade?
hope this points you in the right direction