3D symmetry

Hello,

I am dealing with a 3D geometry in which I have a cone with a hexagonal base. I cut it into 6 axisymmetric equilateral triangles. I wish to give symmetry boundary conditions on the sides of the triangle. Can you guide me as to how to do this in the 3D case? I am attaching the workplane geometry, which I have extruded to form a cylinder.

Thanks,
Priyanka