Nikhil,
The following article explains how to link betweeen a WTDocument and a Package. I believe it should be similar for WTParts:
http://support.ptc.com/appserver/cs/view/solution.jsp?n=CS131346
Nikhil,
The following article explains how to link betweeen a WTDocument and a Package. I believe it should be similar for WTParts:
http://support.ptc.com/appserver/cs/view/solution.jsp?n=CS131346