simple question about cst pec coating， please help

Hi!

I need to calculate the radar cross section of a conical structure 30 m tall with bottom radius 2.4 m and top radius 1.4 m covered by just pec and with Radar Absorbing Material.

I read on a rcs tutorial (see image) for cst microwawe studio that it should be easy, but i don't know how to do it. Can someone please help me?
I have cst microwave studio 2009.
In the attached image there is an example of what i would like to do
(i tried to extrude but i think it is wrong and i also obtain the error because it is not a planar surface)
Thank you very much in advance,

tommy567

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