I while ago, I created this series:
but now I realize that was a mistake—it should really be a separate release, and use the "included in" relationship on the release groups. (Reasons it should be a release include at least that it was sold as one, and that otherwise there is nowhere to include the box's cover art). I'm entering the two-disc release now.
I don't see a way to delete the series, though. I guess I could delete all the relationships off it, maybe that'd get it cleaned up?