Formatting Number based on hierarchy

Hi,

I appreciated in EPM BPC 10 there is a way to format a single member but is there a way to format the figures for members under a node.  For example, hiearchy below

A

-> B

-> C

-> D

B

-> E

-> F

I want to format the figures under node A as to 1 dp and the nodes under B to 2 dp.

However, I dont want to specify actual members becuase new ones could be added and in turn would not be updated, .

Cheers,