Hi all Co-Grabber's, This is Sourbh.
Here is the requested tutorials for Xref Explanation by one student here in Grab-cad.
Link for previous Auto-cad Tutorial " https://grabcad.com/questions/auto-cad-secret-s-exposed "
Some of the Sentences and Explanation were Referenced from Internet Resources, and also from Previous college's Lecture notes during my Academic session.
So carry on for the best Explanation on Xref's.
Answered with a tutorial: https://grabcad.com/tutorials/working-with-external-references-xrefs-autocad
And in Catia.
Answered with a tutorial: https://grabcad.com/tutorials/working-with-external-references-xrefs-in-autocad