[BRX]

You can select collections (and other metadata) during the import into one library. So it is possible that you in the first round you import all the tunes you want and assign it to one collection and in the second go the others and assign them to another one. No individual assignments afterwards necessary. And that would be all in one database/library.

You could also create a library for each collection but you would need to switch between libraries which need to be loaded and equal a new start of the app. (But Mike is going to improve that as well). For now I think it should be sufficient for you to use one library/database with assigning the collection for the imported files.