At the current time, the Emplode software is a "dumb terminal", working only with the database that is on the player. It does not store any offline data. This has the advantage of letting you manage your music collection from more than one computer (such as your home computer, your work computer, your friend's computer, a borrowed computer while you're traveling out of town, etc.) without needing to worry about an updated database being on that particular PC.

This also means that there's no "offline" database editing possible at this time. In theory, something like that could be incorporated into Jemplode, but I don't know if it's been done yet. I'm pretty sure it's not in there yet.

In the meantime, take a look at this and see if it offers any help for what you want to do.