How do I block rollup of numbers at higher levels of hierachy in Demantra?

Hi Everyone,

We have a client requirement to make the rollup of numbers at higher level in the level series (configured at t_ep_item tables instead of sales_data table) as Null in Demantra. For example, consider the following product hierarchy.

Product Line

     ^

     |

Product Family

    ^

    |

Product Category

    ^

    |

Product (sku)

Here the rollup from Product to Product Category in a level series should be average (which can be achieved easily in Demantra), but at Product Family and Product line it should be null (shouldn't display anything). Is there a way to do it.

Thanks

Ramesh