Thank you Laszlo for answering. I draw slab just with two fills, to represent what I needed. Actualy, I need to change height of first riser. For example, on floor I have 10cm of composite skins above the structure (reinforced concrete slab). It means that my first riser should be those 10cm of floor skins plus cca 15cm of structure stairs, and than finish of cca 2-3 cm. But for now all of the risers have the same height.
Also I need the last riser to be 6-7cm od structure, and floor skins of 10cm should cover stairs, so the final height od the last riser, should be 17cm, like all others.
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