I need to pattern this i beam cut out in this sketch, along the curved edge at the top or even the curved edge in the middle of the Ibeam, the reason for this is. I have created a Sketch which will create different part files with certain areas extrude along the sketch.

my plan was to pattern the i beam with the curve in the sketch. The main sketch will be saved as multiple parts with certain sections of the feature extruded to the required thickness. The image below, indicates that all the closed areas(the off yellow) will be one thickness and the part which is not closed(construction lines) will then become a 16mm thick plate in a different part file.

the Ibeam must be patterned all the way into the construction line area, but it seems im not aware of such a feature that can be used in the ACTUAL SKETCH(not feature) and not as n design tree feature.

Any help please, or how would you guys model such a part, note that these will be sheet metal partsketch