Workview Sets and Set Editor
When a dimension is a selectable or hidden dimension, they can have one set definition. Dimensions on rows or columns can have multiple sets. A set is a list of instructions which determine which elements to display, how they are formatted, sorted, indented. Additionally, instructions can be used to suppress zeros or display the alias for the set elements.
Elements can be added individually or as a group in a single instruction.

See Set Instructions for the full reference, and Element Instructions for adding elements from the hierarchy tree.