A workflow action which retrieves repeating section data and adds it to a different list
A workflow action to take each row of a repeating section and create new items in a different list with this data. The UDA's that people have created for this are not as effective as they could be and it is very hard to troubleshoot issue with them
The link menetion by rick is not available.
This is not that difficult. You just need to get the XML, parse the XML and go from there. Check out this post starting from the "Dump that XML" section. http://community.rightpoint.com/blogs/viewpoint/archive/2014/08/13/best-practices-with-repeating-sections-in-nintex-forms.aspx