Local member: subtotal

Hi All,

In the EPM add-on for excel, I am making a report on Product - Customer level, connected to a planning book in DP. The products can have various amount of customers. I would like to make a local member that indicates the total forecast per product (thus, making the sum of the different forecasts of the customers of this product).

Does anyone know if this is possible and if so, which formula needs to be used in the local member?

I have made an example to show this: the upper part shows the as-is situation, but we would like to have a subtotal that indicates the total forecast on product level (to-be situation below):

Image may be NSFW.
Clik here to view.

Thanks in advance,

Kristof