While it is true that you cannot create a Sketch where one of the Sketch Curves is a Bridge Curve, you can create your 'profile' using regular curves where one or more of them were Bridge Curves and then when you create your Variational Sweep, simply project these profile curves into the sketch and go from there.
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA Siemens PLM: UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.