Correct way of grouping tests in TestNG

I am new to TestNG. We are trying to implement POM framework for automation testing. We are using WebDriver, Java, TestNG and TestLink. After executing test cases I am sending result to TestLink.

I have created bunch of test scripts. Each of my test scripts has many test cases. Sometimes we might want to run specific tests for specific release. What is the easiest way to manage this? I know we can disable tests in TestNG but I might have to manually go and update many of my test scripts. I feel group functionality in TestNg is not that good. Any suggestions?