@virgilio_benedictos
If I understood right; you need a section along the X grid (ie: curved showing true length/peremiter of the curve unrolled in a flat view). This is unfortunately not possible. Revit produces its elevations and sections based on Orthographic Projections (ie: perpendicular projections on a plane.)
When producing production drawings for curved surfaces (for resons such as application or further development of artistic/special paterns, graphics...etc) manufacturers use different software into which they can improt the revit model or recreate that element. In Revit there is a somewhat workaround for this which but to do it you need to know the principle before hand when modeling your elevations the first place. ie: it works on simple like internal walls small elements...If you model the elevation wrong the first place this method is basicly useless and not applicable
Hope the above helps.. if it does please Accept as Solution to help others too