Livecycle Form - Table within a table

I am trying to build a table (B) within a table (A). Table B can have from 1 to 4 records (rows).  I want the record in table A to stretch (in height) to accomodate up to 4 records in table B.  Currently, when there are more than one record in table B, additional rows are generated in table A. All the columns are blank, except the column that contains table A.  Anyone have any idea what I've got set up wrong?

Thanks, lclambe