The $GID_LIST property contains the names of the levels used to create the grouping ids in a relation created when the GROUPINGID command with either the ROLLUP or GROUPSET keyword executes.
You can not explicitly define a $GID_LIST property. Oracle OLAP automatically creates a $GID_LIST property on a grouping id relation when the execution of a GROUPIONGID command with either the ROLLUP or GROUPSET keyword creates the relation.
$GID_LIST = levels
A TEXT expression which is the levels, sepearated by hypens (-), of the hierarchies of the dimension for which grouping ids were created.