In left menu, add submenu idea

Although your idea is not very different from the one you made and gotten an answer to:

the case is different. In this new case it is important to note that reports are always generated on the fly and not stored as documents. As such there are no files or folders.

You could consider saving each of these views to your local file-system that you were advised on for documents that you were attaching at:

In our businesses we only keep the bare essentials to quicker view them, but rather than aging them we just edit the dates and descriptions based on the viewing needs and save and send them to accounts on request.