Allocation Logic

Hello Gurus, I am trying to test the allocation in BPC.

I have this scenario:

1. I have a dimention called SKU that has all SKUs that the company sells. Also I have a Hierarchy that represent Product Family.

2. User will imput data at Product Family level, so that I will have a dimension with all the Product Family.

3. I need to allocate the data inputted into all the corresponding SKUs that corresponign to that hierarchy level?

Any idea on how to deal with this?

Thanks

Sergio