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In momentum you can not simulate lumped elements such as capacitors,inductors etc. except microstrip based components like interdigital capacitor... First you create the schematic and use tline discontunities where the discontunity occures. Then you simply click generate/update layout to generate layout.Look layout if there is a problem try to fix it in layout window then simply click generate/update schematic. If you want to design lna with real components select distributed elements from vendor libraries generally they comes with artwork so in layout windows you can see them.After you generate layout , delete lumped components and add ports to their connection points.Define substrate parameters from momentum>Substrate>Create/Modify. The next step is to generate layout component to cosimulate lna.To do this click Momentum >component >create/update and define your frequency range.After creating layout component open a new schematic design and place your layout component.Then add your lumped elements and place S parameter measurement.Then simulate it.Thats all. I attached some pictures that summarizes the process. Good Luck, ALP 1)Lna Schematic  2)Layout from Schematic(Generate Layout)  3)Layout for Momentum  4)Cosimulation 
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