Hi Pandey,
At this point we don't support running Form Builder itself within Liferay. Which means that you still need to run it separately; often this is workable as Form Builder is typically used by a different set of people. But we realize this is an inconvenience, and have an RFE for this:
https://github.com/orbeon/orbeon-forms/issues/2435I've added a +1 from you on the RFE.
Alex
--
Follow Orbeon on Twitter: @orbeon
Follow me on Twitter: @avernet