CRM Dependent Object

Hi,

First of all don't delete the question ,if it doesn't belong to this particular tag..--> For Administrators

My qusetion for SAP Pundits is that...

I have a root object ,say " BuilHeader " so, know i need to create a custom object which is a dependent object

of the root object "BuilHeader" ,How can i do It??

Please Help,

Also Try to explain the Procedure..

Regards