Projects can reference each other, so typically, you create a "controller" project that references the other projects in your solution. In that project is where you tie the various parts of other projects together. To reference a project;

1. In the solution explorer window, right-click on the "controller" project and select "Add Reference".
2. Select the project(s) you wish to reference.
3. In the solution explorer window, right-click on the "controller" project and select "Manage Imported Projects".
4. Move all of the projects to the right side of the window.
5. Now you can see the other projects and their adapters and automations in Object Explorer.