To Delete a User Defined Hierarchy
Display the User Defined Hierarchies in the middle pane, select the User Defined Hierarchy to delete, right-click and select Delete.
OLAP Dimension User Defined Hierarchy Levels
The levels specify the drill path over a set of related attributes. The classic hierarchy levels are Year, Month, Date in a Calendar based hierarchy in the date dimension.
To view the properties of a user defined Hierarchy Level right click a user defined Hierarchy Level and choose properties to show the dialog below: