help with heirarchy in DT

Hello,

There will be heirarchy (context change) in the source and reciever DTs

How do we create the source / reciever heirarchy based on the source / reciever?

if heirarchy exists, how do we map to each other if multi mapping is required?

please send me blogs or pdf detailing me about this heirarchy in DT and working with it...

venkat162@yahoo.com

regards,

venkat.