Use Total in different Block

[RiRo]

Hi Members!

I have a Report with 2 Blocks.

In the First Block I use a Table with additional Infos about a product.
In the Second Block I use a List which calculates different values about that product.

Now, I want to Display the total of cost, in the table of the fisrt block.

I use Cognos 8.4 so I have to check the Items from the specific query that I can use it at the whole page.
This works fine for a single value but not for the total from this list.

Could you give me a tip how I can resolve it?

Thanks
Rob