Hi,
If you are displaying A,B just for sorting then there is no need.You can directly apply ascending sorting on col1 and you will get sort data.
If this is required with break then follow steps.
I am assuming this is table 2 .Right click Manage break and uncheck the option "Break Header".After this you can only see data only.
This is table 1. Insert one more table with similar columns and select Header row and delete the row.After this there is only one row in this table.
Right click on the table 2 and click align->Relative position and change the values as per attached screenshot.
After this both tables will look like as a single table and then add header definition and do the formatting.
Amit