CHILD
Returns the nth child of a specified consolidated element.
    Syntax
CHILD(Dimension, Element, Index)
      
Dimension is the name of the dimension
        which contains the element in question. Element is the
        element whose child you want to determine. Index is the
        number of the child to return. 
Example
The Europe element of the REGION dimension has these children: Austria, Belgium, Czech Republic, Denmark, France, Germany etc., in that order. This example returns Germany:
CHILD('REGION', 'Europe', 6)
      
This example returns Belgium:
CHILD('REGION', 'Europe', 2)