You can expand or collapse the hierarchy by using the expand and collapse toolbar buttons. You can expand or collapse the entire hierarchy, or you can expand or collapse individual parent members.
To expand or collapse the tree:
Make sure that the Tree View tab is selected, and, from the Metadata Item drop-down list, select a dimension.
To expand the hierarchy, select a member and click to expand the current member and all members below it in the hierarchy.
To collapse the hierarchy, select a member and Click to collapse the current member and all members below it in the hierarchy.