The typical application for export and import is a multi-station NiagaraNetwork, where you import a schedule component from another station. Typically, you import a schedule component that resides in a Supervisor station. This creates a local copy that you can use and link into control logic, but cannot otherwise configure (change events, and so on).
When you import the schedule, the scheduler automatically creates a schedule export descriptor in the sending (master) station under the Station component that represents the receiving side. This allows for sending-side management of configuration synchronization.
If you are using the BACnet driver, the same basic architecture is available. You can import BACnet Schedule and Calendar objects from a BACnet device, and model them as schedule components.