To add a new project into a solution, you simply right-click on the solution in the Solution Explorer window and select Add then New Project. You would then need to add a reference to it by right-clicking your controller project in the Solution Explorer window and selecting "Add Reference". Add a reference the new project. Finally, right-click your controller project one more time and select "Manage Imported Projects" and move your new project into the right-column. This will allow you to call automations and use resources from your new project in your controller.