Visual Studio 2005 SSRS How to add cells from two different tables

I am using version 2005 of Visual Studio. I have 2 separate queries loaded into 2 separate tables. I need to take a value from one table and one value from another table and do a calculation but I can't figure out how to access both values since they have different scopes. Any help would be appreciated. 

Table 1

val1val2 val4total1

Table 2

val1 val2val3 total2

Independent cell from table should hold total1 + total2