Hello Mallikarjun,
If you go to
About | Webcasts - Ingres and search for "Alchemy" (in the "On Demand Webcast" section near the bottom of the page) you will see a presentation on the process.
The process is performed by Luminary, an Ingres company based in the UK. They have done many of these projects and can perform other extensions to the application while doing this work as well.
Hope this helps.
Chip Nickolett (chip.nickolett@ingres.com)