Hi Madhu,
Welcome to this Microsoft Project newsgroup
You can have many levels, though to have more than five or six would be
unusual. The levels are created by indenting tasks, whereupon the task
above becomes a summary of the tasks indented - it appears in bold by
default. What exactly are you after? Give us more specifics and we may be
able to help you more. Have you seen my tutorials?
FAQs, companion products and other useful Project information can be seen at
this web address:
http://project.mvps.org/faqs.htm
Hope this helps - please let us know how you get on
Mike Glen
MS Project MVP
See
http://tinyurl.com/2xbhc for Project Tutorials