Multipe levels of Focus?

Here is what the Help file OO4.1.4. says:
You can also assign multiple levels of Focus based on the structure of your document. For example, if you have a row with a few nested children, you could assign focus to the one of the child rows, and again to one of its rows if any were nested

Could I have an example ? is this a feature of OO 4.1.4 ?