Syntax for Custom dimension members:
'Label, IsCalculated, SwitchSignForFlow, SwitchTypeForFlow, UserDefined1, UserDefined2, UserDefined3, SecurityClass, DefaultParent, Descriptions
The following example specifies attributes for members of the Custom3 dimension:
!MEMBERS=Customers [None];N;N;N;;;;;DefaultParent=#root AllCustomers;Y;N;N;;;;;DefaultParent=#root Customer2;N;N;N;;;;;DefaultParent=AllCustomers Customer3;N;N;N;;;;;DefaultParent=AllCustomers Customer4;N;N;N;;;;;DefaultParent=AllCustomers Customer5;N;N;N;;;;;DefaultParent=AllCustomers