Assuming you mean full client reports, look here … List objects used in a series of reports. If you mean WebI reports, there is also a WID Scanner tool here in BOB’s Downloads.
The full client utility will document the classes / objects used, but not the tables / columns directly. Remember, a single universe object could reference many tables / columns. That said, you could use the output from the full client documentation and link it (on your own) to the universe documentation, and get very close.
Dwayne Hoffpauir 
(BOB member since 2002-09-19)