Like many who use this forum, I encounter a problem.
I have a structure to make on a concrete slab (called diamond point), so it is made up of several slopes. The 4 corners of the slab have different heights as well as the middle points for rainwater drainage.
I wanted to go through the "boss/smoothed base" function but it tells me "cannot connect the surfaces together" although I see the final shape I want.
It is true that SolidWorks does not accept to generate the volume by smoothing based on your Sketch3 and Sketch3D2. He agrees to do this by using other profiles and guide curves for this smoothing. The steps: - reorder the sketches in this order: Sketch1, Sketch3 and Sketch3D2. - open and complete the Esquisse3D2 by building all the edges of the future volume (see image Dalle0.png). - generate the volume by the volume smoothing function using the two closed blue groups as profiles and the 4 purple segments, open groups as guide curves (see image dalle1.png). Use the SelectionManager feature to select entities. Your version of SW is quite old, I can only offer you the attached images.
One note: the principle of the diamond point is to generate a surface based on planes limited to their respective intersections. The upper surface of your volume does not meet this definition, surfaces are not planes. Make sure that rainwater will drain well...
It requires a little time though: creation of the 4 (or 8) surfaces then stitched on these 4 surfaces to finally be able to do the extrusion to the sewn surface. The big advantage of this solution is that it will work all the time.