named sets
Named sets are customised lists which can be used in place of, or with,
		the levels in a dimension. For example, a Region dimension might contain the regions Asia,
		Europe, Middle East, Americas, North America, South America, Australia/Pacific and Africa,
		but not the EMEA region (Europe, Middle East and Africa). A named set could be used for the
		EMEA region. 
Named sets are created in the OLAP database where they are referred to as subsets.