Info-Object Hierarchy & BEx

Hi,

I have created a info-object (0Material) hierarchy in our BW system and use for BEx reporting.

In my report I have following columns & I use above info-object hierarchy for the query.

<u>Material Volume QTY Total</u>

Total = Volume X QTY

How can I suppress higher node values in Volume/QTY fields?

How can I get the total volume of (summation of individual line items) of all below nodes?

Thanks,

Ama.