Please some one tell me to how to integrate the geometry made in CADD tool to the Geant4 simulation?
If you need to do that, you will probably be better off with something like TOPAS, which is built on top of Geant4 and can do exactly that:
https://sites.google.com/site/topasmc/
On the downside, you'll have to pay (I think about $US800), but it is excellent software and well worth the investment (you get full non-redistributable source code). They just finished the beta testing period and it will be available commercially very soon.
Failing that, you'll probably need to code up something yourself :-)
One possible way - if your CAD software supports it - is to export the geometry as a GDML (Geometry Description Markup Language) file, then import that into Geant4. Details on GDML are here:
http://gdml.web.cern.ch/GDML/
Details about using it with Geant4 are in the GDML user manual, see around page 44.
Here is a talk by Joseph Perl (one of the authors of TOPAS mentioned in another post) where he shows how to convert CAD to GDML for importing into Geant4:
http://geant4.slac.stanford.edu/TAMU2011/Geometry3.pdf
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