The Number of Levels in the dimension hierarchy. This should correspond to the hierarchical levels in the table to which you are mapping this dimension hierarchy.

If you are using this dimension hierarchy as the basis for a cube, ensure that Elements are Mutually Exclusive is checked (by default, this option is checked). Otherwise, you will receive an error when you use this dimension hierarchy to create a cube because the elements cannot overlap in a cube. If you are creating a dimension hierarchy purely for use in selecting from a strategic segment, then it is permissible to disable this option and create overlapping definitions. It is recommended, however, that you creative non-overlapping bins so that dimension hierarchies you create can be freely used both for building cubes as well as with strategic segments.