I came across many other SO question but could not found the answer what i needed.
So heres my problem.
I have created a simple app that just shows the google map and shows my current location.
and then I have created another TabBar based application.
Now how I will include that map application to my new TabBar based application.
And when I select the tab the map project should show its data.
means the map should be shown.
How this could be achieved??
You might want to create a Workspace if you want to manage code base for 2 projects sharing same resources.
Here are some links that will help you get to know how xcode workspace works.
http://developer.apple.com/library/ios/#featuredarticles/XcodeConcepts/Concept-Workspace.html
How should I manage dependencies across projects in an Xcode workspace?
http://blog.harbinger-systems.com/2011/11/workspace-%E2%80%93-better-way-of-organizing-your-xcode-projects/
http://cocoamanifest.net/articles/2011/06/library-management-with-xcode-workspaces.html
You might or might not get much help from the last link but it will be of a great assest for you to learn the library management from workspace.