Meena --
1. You delete an enterprise project using Admin - Clean up Project Server
Database in PWA.
2. You delete an enterprise calendar in Microsoft Project Professional by
opening the Enterprise Global file, clicking Tools - Organizer, selecting
the Calendars tab, and then deleting the calendar.
3. You delete an enterprise resource by using Admin - Clean Up Project
Server Database in PWA.
Given the very basic nature of your questions, please refer to the following
FAQ for information about documentation, books, and training on Project
Server 2003:
http://www.projectserverexperts.com/Shared Documents/PS2003Documentation.htm
Hope this helps.