I have a dimension with levels from 1 to 3.
I have defined a set as {level3a, level3b, level3c}. This
set has members from level3 under different hierarchy.
With this, how do i get a set which has all the parents of
the above set.

Ancestor function takes only members and not set. Is there
any function which gets the set of parents for a set of
members?

Thanks
GS