InfoPath Dev

 How would I programmatically add rows to a nested repeating tabled based on a drop down selection? I have a repeating section with a drop down, button, a repeating table and a hidden field that calculates how many rows to add to the table based on an external data source. I used the below code to add the correct amount of ...

 Each column has a sting (not table). The rows could get up to 35-40.   I have been playing around with XML a bit but don't know how to get a SharePoint column (populated with a string) exported into a XML file. I also don't know how to import and XML file to populate a repeating table. 

What I want my project to look like: User: fills out Form A (InfoPath 2010) with several fields and some repeating tables. Form A: Concats the repeating fields into a string separating the values by a ",". User: Submits that form to a SharePoint (2010 Enterprise) form library.  User: Fills out Form B with two ...