Please see the attached picture for better understanding.
We are having abc.com (windows 2003) domain where there are two 2x Terminal server (load sharing), one server for storing user's data (my documents, profile etc) and one domain controller of abc.com with terminal server licensing role installed.
We have another large domain exists- example.com . Now we want that
1) The two 2x Terminal server (load sharing) now be the member of example.com
2) one server for storing user's data (my documents, profile etc) now be the member of example.com
3) Transfer the terminal server licensing role from abc.com's domain controller to one of the domain controller of example.com, so that we can decommission the domain controller and demot the abc.com