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Click Assemblies on the Model panel.
The Assemblies palette displays.
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Click Stair .
The Stair palette displays.
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Click Spherical .
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Select a Template.
OR
Fill in the stair data as needed. For more information, see Stair.
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Select Points from the Place By list, then enter the Vessel Diameter in the Spherical tab.
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Click Insert.
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Select the center point of the spherical vessel in the model space.
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Select the direction for the stair.
The software places the stair around the vessel.