Kalipso lets you to link your Project to other Projects and/or Components. This allows you to divide a Project in several parts and assemble them into one Project.


Link to Project
All objects in the linked Project are made available in your Project


Link to Component
Only exported objects in the Component are made available in your Project
    
                                    
Export
When a linked Project/Component isn't set to export, it's not deployed along with your Project

The only scenario where you don't want to export a linked Project/Component is when you have bidirectional links. (Project A links to Project A and vice-versa).