populate repeat group from table

Hi all, I have two joined tables and the second table has a repeating group. I would like to preload the table data into the repeating group of the form. I thought of modifying the form template, the "default_repeatgroup_table" file, creating a query that populates the repeated group. I have the problem of populating when there are multiple rows in the table why should I create as many repeating groups as there are rows in the query.
Can anyone show me a way?
Thank you

 

Here are some hints. I recommend option 2.
http://fabrikar.com/forums/index.php?threads/form-populate-repeat-group-with-items.46902/

 

Thanks for the reply.
The repeating group not of the same module but of a joined module. The xx_repeat table was not created and therefore I don't have the parent_id. I keep looking for a solution.
Thank you