Section of stairs

[ingjaidenrincon]

Good morning fellows.
I would like to know how I can convert this section of stairs based on lines to a solid or a surface, I appreciate the collaboration.

[GavinCrump]

Generate lines for the side profile of the stair instead, then extrude them to the side.

[ingjaidenrincon]

Thank you very much for the answer, it helped me a lot, now I would like to know how I can show the staircase area, directly in revit.