I want to divide the stairs with the intersection of red lines. Such as rivet
You can add steps to the landings at corners after having inserted the stair (from the stair Properties dialog). Do double click on the stair object (or run the vaProperties and select the stair) then, edit the landings in order to add steps. First of all, choose a stair style that is not balanced. However, there are some errors using this option since the steps don’t reach the stair corners. We are currently looking at this.