Help with replicating dir structure

Dear all, new at the forum... great work the SW and the community too!

My question is the following. I use my Sony TS1 to read and to note a lot of PDF docs. So, I need these to be synced back to my laptop, where I keep my full bibliography.

I do this via dropsync, but I would like to sync the Calibre biblio as it is, and to be able to manage the metadata via Calibre (titles, tags, etc). So:
-if I sync my biblio as it is, and then I connect my device, Calibre is not able to recognize the presence of the documents on it as Calibre bibliotheque.
- but if I first sent my Calibre biblio to the device (with the aim of keeping it synced later on), it would reproduce a dir structure which is not exactly that of Calibre. And therefore I will not be able to sync it.

The solution is to play with the template, and to 'send to device' through a template that reproduces the Calibre dir structure. I've done several tries, but no success...

Can anyone help me, by posting the template that reproduces exactly the Calibre internal dir structure?

THanks!

Max