SAP IBP - Key Figure Data load at aggregate level

Hi Experts,

I have a KF "SBU Input" defined at PERPRODCUST base planning level.

This KF is editable in nature. Users are expected to input the data manually at an aggregate level of SBU (attribute of Customer) and Product.

However the existing data volume is huge and this data is already available in an excel file. It is a tedious job for users to input all the data manually.

Is it possible to do an automated load of the data at this aggregate level of "Period-Product-SBU". Data is not available at the granular level of "Period-ProdID-CustID". Is there any work-around?

Thanks in advance.

Regards,

Paul