Using ADS, Help need for drawing defected ground structure

Sir,
I want to remove some part in the ground plane, want to work on defected ground structure (DGS). I am new to the DGS using ADS 2009, can you anybody show me help document for drawing defected ground structure in ADS 2009.

Dear Sir,
For drawing defected ground structure using ADS2009, What topic in the help manual , we have to read. Can you any body suggest me and I have attached the help manual contents of ADS2009.

There is no topic about defected ground structures in ADS manual..
If you want to create a defected structure, you should define a GND layer just underneath of the dielectric layer then you should set main Bottom GND as Open.
But Momentum is not a good tool for defected ground structures because its nature.

Sir,
Thank you for your help. For getting defected ground structure, do we need to set EM(ElectroMagnetic)simulation. If yes, how do we EM simulation for defected ground structure and how to add ports to EM structure . Is there any help documents.