Core 1. QuickConst

To create a new Core Cell, right click in primary structure view, and select new Core Cell.

Double click it to enter the core structure.

Right click in normal area (the wide area between input and output area), and select
Built-In-Modules -> Math -> +.

Right click on the inputs and select Connect to NewConst, and change numbers to 2 and 3.

Right-click on the output area, create a port and name it sum, and wire it to the output to adder.

The core cell structure:

The primary structure (with a Numeric to display the output from the sum):

The panel view: