Rakesh, you are very close. Inside the
default.xml file for Navigation, you are correct in using an
a href. However, unless you include a protocol (
https), Splunk will interpret that as a relative url. So just include the protocol.
<nav> <collection label="Dashboards"> <view name="mydashboard" /> </collection> <collection label="Search views"> <view name="mysearchview" /> <a href="http://www.google.com">Google</a> </collection> </nav>
That is a different question then your original. Now that google opens in the window, you have to allow the target to be _blank, and default.xml doesn't allow some attributes.
See http://answers.splunk.com/answers/11654/appbar-links-open-in-new-windo on how to put a _blank target on the href.
Please accept the answer, as it is correct for your question.
You have given so little information here, and a badly formed link, it is hard to know how to begin to answer.
Perhaps if you provided some more context, and pasted in the relevant XML (or whatever you are using for your app), someone might stand a chance of helping.
Hats off to woodcock for giving it a try!