Hi Siva -
I assume you saw Eric's email response to your question, but in case not, he said:
"If you move your mouse pointer to one of the borders of the existing pivot table, a thick line will appear with a pop up message saying 'Click here to insert new component'. If you click, a shortcut menu will appear giving you the opportunity to add a new component where the thick line is. This menu includes pivot table."
- Bob