To get value from secondary dataset which is not matching in primary dataset

Hi,

In my report using two datset in the tablix dataregion.

Added one new row in tablix. I need to show in this row, the value from secondary dataset. 

My report as like,

Prodno            ProdTitle           Year          Jan     JanBtch    Feb      FrbBtch     Mar ......

123                    xxx               2010          0         12         23           40           8    

                                             2012           4         67           0         0

2010 and 2012 are in primarry datset. But in secondary datset 2011 is there. I need to add in my report for that year. JanBtch,FebBtch column values are from secondary dataset which will show by matching with year value in primary.

If i need to add one or more rows if secondary dataset have other than primary dataset year value what to do?

Thank you.