As soon as you have a project to host your configuration, you create the configuration file.
This is done using the same key combination: <CTRL>N, then select the NoC configurator creation wizard.


Give it a name, then click on "Next"
Please note that the file name must have the extension "'noccfg"

Choose the NoC model you want to work with. This file is provided by the hardware design team and contains the needed NoC definitions that will be used for a particular Stellar platform.
Now your project is ready and is opened in the editor area of the tool.