> For example in the automatic "auto-place mode" perpendicular section
> don't appear on the path (except extremities)

Hi Pilou - that's not correct, auto-place mode will place perpendicular sections along the interior of the rail as well, not just only at extremities. For example here I have 3 sections. Just arrange them in a rough left-to-right order:



Each profile is placed perpendicular to the rail curve, spaced evenly along it. In this case the outside 2 curves are on the ends of the rail, but the middle ellipse is placed at the center of the curve. You can put any number of profiles in a similar way. The spacing between the profiles on the plane doesn't matter, they will get spaced in even increments along the rail.

But don't forget - it can be better to use a scaling rail if you want to control the size at different points instead of placing a bunch of scaled profiles. But if you want slightly different shapes (instead of only changes in size), then that's when you would do different profiles.

You can also use multiple profiles and the scaling rail in combination.

- Michael