The attached file (SW2013) is of a body that is an extrusion with draft on the four sides.  I need ithe draft to be on only three sides and was previously told to just select the three contours to have the draft.

To extrude the body from the sketch, I need to select the four sides to achieve a closed sketch.  But when trying to edit the extrusion, I cannot find how to "un-draft" one of the sides.  I have searched  Help and Tutorials to discover how this could be done without success. 

Thanks,

Bevin.