You're right, that was Inventor Fusion. In 360, I'm not getting dimensions to show up when creating an ellipse, but I am able to add dimensions after creating an ellipse. Going back to your workflow, it looks like those instructions will create a stepped object rather than a smooth object. After extruding the ellipse, it doesn't look like I can add dimensions to the extruded surface (dimension tool isn't availabel for this purpose—it's grayed out) to taper the shape. I can only create a new shape on the surface, add dimensions and extrude it. Any suggestions?