Creating a new Source book

[Mathias]

A related note - you can still assign things to the parent source even after you make it non-selectable. In the Pathfinder files, this is used for things that should be common to any game set in the world of Varisia, rather than things used for a specific adventure path. For example, the Varisian versions of each of the base races were defined in the player's handbook for the first adventure path, but rather than giving them a source of "Rise of the Runelords", they're assigned to the parent "Pathfinder Adventure Paths" source, so that if the user selects any or all adventure paths, the varisian versions of the races are there for use. (or at least I hope I set it up that way - I usually have all four adventure paths active on my system so I might have missed a few things like that).

For Dragonlance, that may not be the way you need to handle it, since all the books tend to be describing different facets of the same setting. Also, you have an overview book, which the Pathfinder books don't have.