Apologies i thought you were trying to utilise the Stair Tool only!
If you are trying to drive this shape with Parameter's you will need to a lot more work in the extrusions etc. and not worth it for a one off but if this is repetitive maybe work the additional time and effort?
Thee simplest option would be to just draw the Stair in different segments using simple extrusions for the Runs and the added Fanned Landing as another separate extrusion with voids and bring it all together at the end in a Group or Assembly
Another issue is your Family Category as this will not allow hosting of rebar

Jay Colcombe
Autodesk Certified Instructor
Revit Architecture & Structure Certified Professional
AutoCAD Certified Professional
B.Sc. Hons Civil & Structural Engineering
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