I want to use simulate a  situation, where I have a setup of different computers and server at different locations and different vendors providing AMC ( annual maintenance contract) with different SLA. So I need to have the relation (maping between all) between the data entered in one cI class Item with other . eg- if I create a new item of computer type in CMDB I want that the vendors list should be displayed in dropdown menu for selection ,  similarly the locations also .When I display the computer details the detailed information about the Computer +its vendor details and sla to that device will be also displayed .