Cabinet Pro Software allows flexibility in the creation of angled cabinets to fit under a slanted ceiling.  Some options include having the cabinet top elongated and angled to connect the two unfinished ends, extending the back or adding a front to cover the cavity created by the raised ends, and adding a frame rail to trim the slanted top.

Watch a video: https://www.youtube.com/watch?v=9EpG9YOMCn4