Hello Latif,
Derived and associated objects are created by attaching an ECAD Content definition object to the relavent CAD document, Schematic or PCB. After the content definition is created and attached, you import the data into the workspace from the client. When the checkin occurs, you will have attachments or derived objects as defined.
This is a primary topic of my presentation at PTCLive in Anaheim, CA., USA titled "Presenting the ECAD Data Model in WindChill 10.x"
The slide deck will be available after the presentation on Monday June 10, 2013 @ 11:15AM.
Please feel free to contact me directly if desired.
Scott Claes