How to configure SSIS 2012 project to run under different environment configurations?

How to configure SSIS 2012 project to run under different environment
configurations?

References

Reference NO 1

http://stackoverflow.com/questions/15206184/how-to-configure-ssis-2012-project-to-run-under-different-environment-configurat

Reference NO 2

http://dwjunkie.wordpress.com/2013/01/14/ssis-2012-configuration-guide-part-1-introduction/

Reference NO 3

http://sqlmag.com/sql-server-integration-services/ssis-deployment-sql-server-2012

Reference NO 4

http://dataqueen.unlimitedviz.com/2012/01/ssis-2012-package-configurations-menu-option-missing/

Reference NO 5

http://www.jasonstrate.com/2011/01/31-days-of-ssis-environmental-variable1731/

Reference NO 6

http://social.msdn.microsoft.com/Forums/sqlserver/en-US/3f49b931-0250-4c26-94b1-1d22f1e47dfc/action?threadDisplayName=ssis-2012-environments

Reference NO 7

http://www.aaronlowe.net/archive/2012/08/ssis-2012-project-configurations/

Reference NO 8

http://www.bidn.com/blogs/cprice1979/ssas/2586/build-configurations-in-ssis-2012