implementing Low Pass Filter on Momentum

i am well familiar with implementing microstrip and stripline structures on momentum but not with lumped elements..i have to simulate a low pass lumped element filter on momentum..please guide me through the complete procedure

You cannot simulate lumped elements in Momentum because it doesn't recognize lumped lements.You can simulate PCB/substrate in Momentum by placing internal lumped elemets' ports then you should create a Momentum view in a schematic view with these internal connection ports ( of course input and output ports) then you will able to simulate whole circuit in a schematic view.Look at ADS help how to do..