The Integrated Circuit is a component that allows you to package up a group of components into a single reusable component. All Pulse and Toggle Buttons will be mapped to inputs and all Light Bulbs will be mapped to outputs. Remember that you cannot use any other inputs and outputs except those three.
To create new Integrated Circuit you need to click blue button in the bottom right of main menu than click NEW INTEGRATED CIRCUIT. Now you can add some components and save your IC. The name of the file you saved will be used to identify your circuit on components list. When your file is saved close the circuit and create new project or open existing one. Now enable Edit Mode using switch in the top left corner and click the blue button to add components. Scroll to the bottom and you will se file you previously created (all IC files got .slij extension). Click on it and your Integrated Circuit will appear on the schematic diagram.
Allowed inputs and outputs
The screenshots below present a full adder circuit and the same circuit after importing into a project or other IC. As you can see inputs and outputs on the second image corresponds to labels of Toggle Buttons and Light Bulbs in the first image.
Full adder Integrated Circuit while editing
Full adder Integrated Circuit imported to other project
To change the label below your IC, click double T icon on the top bar. In order to change the color of your Integrated Circuit click the color palette icon on the same bar.
Remember to save your IC after any changes.