You create a netlist using the project editor. To create a new netlist, select File - New Netlist from the main menu of the project editor or the session tab. The project editor tool bar and menus change for the netlist editor, to allow you to add elements and networks to your netlist.
The initial netlist file contains a default two-port network named Net. The last network in the netlist is the main network. The main network is the network whose solution you are solving for in this netlist. When you analyze the netlist, the response data produced in the analysis is for the main network.
To edit the attributes of any item in the Netlist, first select it, then choose Edit from the Object menu. Alternatively, you can double-click on any term in the netlist to edit its attributes.