how to design spiral stair?
Welcome to SolidWorks forums Pramura.
Check thes videos:
How to Model Spiral Stairs in SolidWorks
SolidWorks - Spiral Staircase
SolidWorks - How to draw helical stairs
SolidProfessor: Creating a Spiral Staircase
Check example here: https://forum.solidworks.com/thread/35097
You might also find this post helpful for your future reference.
Thanks for your help.
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