Hierarchies allow the model designer to specify navigation paths for the user. Usually, this is done in order to group members of a particular type together. A simple example of this is grouping months of a year together.
Yearcolumns by holding down the Ctrl key while selecting each column.
Rename the hierarchy to
Month By Yearby right-clicking the hierarchy name and selecting Rename from the pop-up menu.
Return to Excel and refresh the PowerPivot field list to show the new hierarchy in the dates table.
Remove the Months member from the existing Pivot and add the Month By Year hierarchy. Note that all years are shown (since these are the...