create a grid wich contains the totals of other grids KENDO

Question

HI guys,

 

I've got several grids (2 or more) wich contain detailed information about products. Underneed every grid there are the totals (sums). But now comes the question. How do I create a new grid cntaining the sums of the sums . see example

 

 

 

Now I need to create a new grid wich shows te totals of both grids and olso calculates the sum of the totals of the grids. how can I realize that?