Using List-Control to add combinations for pre-calculated percentages

[ksachar]

My Aggregated post-manipulation data looks like this:

<please see attachment>

There and thousands of customers, multiple products, 60 + months. Profit is calculated using a complex formula.

I want to plot the return using bar-chart/ Histogram and have a list control on the side as a filter so that check a check box provides me that specific product. If I select multiple Product types in the list control. SAS-VA will sum (aggregate it). But since net profit is a %. The sum of % will not make any sense.  I can calculate %  for all product type combinations in the ETL:

<please see attachment>

Is there any way that I can create a functionality where I select multiple product type say X and Y in list-control and (by using a parameter or something else) the bar chart shows me  13% as compared to 15% (which will be summing up 2 returns) ?