Hi Piyush,
It is easy to do,just login to your GA account and grab code from it.Add that code to your website .

I think you must google it how to it perfectly.

You absolutely have to add your new domain (site) to google analytics. You'll probably have to generate a new code as well.

Login into google analytics and add your website and get the code and put it into your website.

You have to install analytics for your new website again.
Use this link for install analytics ...How To Set Up Google Analytics for Your Website - An Easy Tutorial

I also recommend for new google analytic.