QuoteI have couple of questions regarding the customization
A "couple" ?!? I counted 4 :-)
Quote1. What are the steps to deploy Admin and App war into Liferay 6.2. How to access Admin and App ?
There are videos and docs to help you with that.
"C:\Program Files\KonaKart\doc\LiferayPortletInstallation.pdf"
and
http://www.konakart.com/documentation/videos-installation (http://www.konakart.com/documentation/videos-installation)
Quote2. How can i customize the Admin UI (Ex: How to remove Menu / Sub menu like Tools / Custom) ?
Read about Role-based security in the User Guide
Quote3. How to integrate new Sofort payment module ?
It's easy enough. You take one of the existing payment modules (you get full source code) and make a copy for Sofort. There's a tutorial in the User Guide to guide you through this process.
Quote4. How to integrate new DHL shipping module ?
Same as above for the payment module.
If you don't want to write them yourself you can write to sales@konakart.com and they will provide a fixed price quote for their creation.