Linking Filtered Result To Subreport

I am relatively new to SSRS and having some problems showing the right results from my subreport. I am using a cube for my datasets. I have created a report parameters where I can filter out year and months to see the sales in certain month. I also want to add a calculation to display the sum for the choosen period.

f.exs. if I choose january 2004 my result look like this:

Key Product Amount
41999 prod. x 5,000
42999 prod.y 2,000

Totals: [results from subreport showing total of 7,000]

What I would like to do is to add a total that calculates the total according to the filter. I tried to add a subreport beneath, but I don´t know how to link the filtered condition to the subreport, so it displayes always the total amount for all years from the cube.

Hope there is some neat way to do this