AET : How do I enhance a table structure

How do I enhance a table structure (not just one field), using the AET. Is this possible?

All I have seen so far from you and other blogs (demos) is adding single fields to a header view like that. Now, I would like to add a add custom field (column) to a item list (for eg in a service order) which is a table structure.

Please advise.

Thanks in advance.