feko+help

I am using feko to simulate an antenna .I want to put half of the parabolic reflector above a ground plane (60*30cm),but it seems that it is impossible to be accomplished in the FEKO editor .Because the half parabolic reflector and the ground plane can't have the common triangle edge in the FEKO editor.I want to if only other CAD tools can do it. Can it be accomplished in the FEKO edito?
I have search the user manal,and it seems that the circular column can be put above the ground plane!

thanks !