Creating Summary Report - Based on Running Sum on a Detail Report

Hello All,

I have requirement where I need to build a summary report based on a detail report, which includes RunningSum. The requirement in terms of EFashion is something like:- For each store, I need to identify the count of SKUs which contribute to top 50% of my Revenue.

I want to have Summary Report that shows Store and SKU count, and a detailed report which shows Store, SKU, Revenue, Contribution, etc.

I have attached the detail report. For this store the summary report should show SKU count as 3.

Any suggestion on this? My problem is that Running Contribution uses RunningSum which is based on result set in the block and won't give required result if I remove SKU dimension. So, in nutshell, I need to apply RunningSum at SKU level without actually showing SKU dimension in the block. Hiding SKU dimension won't help, as it won't aggregate and still show individual rows.

Any suggestions?

Thanks,
Sameer