The Constructs tab of the Project Navigator palette is where you add the basic building objects for your project. 
On the Constructs tab, you can do the following: 
- Add, modify, and delete constructs and elements within the project. 
- Open and close existing element and construct drawings. 
- Create categories for constructs and elements. 
- Reference elements into constructs. 
- Launch the Content Browser to access the project library.