Two additional options are made available when partitioning and addressing two or more dimensions: At the level and Restarting every:
Both At the level and Restarting every allows the author to choose dimensions from a drop-down menu. At the level allows the author to choose what level to increment at and, as the name suggests, Restarting every allows the author to choose which dimensions to restart on. The many examples here will provide context for your understanding.
Note that At the level has one additional choice: Deepest. In this case, setting At the level to Deepest is the same as selecting ...