oops, sorry for the late reply, wrong subscription settings as the discussion progresses.
In PJ the SW file in step format, but almost only sketches, not sure if it will pass in step.
Otherwise, in summary, I'm looking to design a simple 1/4 swinging staircase, but I'd like to take the opportunity to do something parametric in order to adapt it if the demand emerges a second time one of these days.
To advance the schmilblick I started to draw a balanced 1/4 turning using the harrow method to calculate the swing, but the result was frankly not ideal aesthetically to have an inner stringer as I wanted it (not very aesthetic breakage).

So I resumed the swinging to limit the number of swinging steps, and go from 10 to 5. Here, the result is much more adapted to what I wanted aesthetically, but probably a little less comfortable.

The change from 10 to 5 balanced steps was unfortunately not done very easily, with many unresolved constraints, to be redone, ... This is where the parametric side would have interested me: to be able to correct just the parameter of the number of steps balanced and that everything adjusts automatically. But maybe I'm asking a little too much. So if you have an idea on the process to follow to achieve this goal, I'm interested.
And if my extrapolation of the 5-step swing is messed up, I'm open to any constructive comments. If Franck wants to see what it would look like with his Inventor configuration, the input data are:
Finished height: 2.91m
staircase width: 0.95m
First quarter length low (I already don't remember the technical name and am too lazy to search): 1.70m
Length second quarter top: 3.49m
Thank you.
gabarit_escalier.step