AutoCAD Civil 3D

[#1]

I want to know green area on subassembly.

I attach screenshot.

magenta color line is grass.

How can I express grass on subassembly?

[#2]

Select the magenta subassembly, go to Subassembly Properties. Go to the Codes tab. Select the link code for your magenta line and set the Render Material to Grass - (Needs to already be defined in your drawing. There should be a couple).

Gambatte!

[#3]

Thanks! but I just want to show green area on cross section view.

We don't need 3D version... so what should i used subassembly for green area?