Looking for Multi-Vendor Extension

Hi There,

I'm looking and failing to find an extension that will allow me to link an author's customer account with sales statistics for their books.
Ideally I would like for an author to be able to click on "Sales" and then get statistics (in graph or list) of the sales they've had today, this month, last month, month before last etc from the site, and then I would like the ability to either add third party sales to the graph OR a line or two under the graph saying something like "Sales from Amazon are as follows."

Does anyone know of one? Or is anyone able to help in creating one?

Thanks,
Beany