[Adoby]

You use the series and series index fields. That is why they are there.

Sometimes it is possible to get the series information from the filenames, when you add books. There are a lot of threads about that here. Search for "metadata from filename".

If all else fails, you can enter the series information manually.

When you send the books to the device, you can add the series information to the filename using the send to device template, or to the title using a plugboard.