Hello Dalacarelia,
Here is an example that uses the repeating section with a select check box from the data source. In the first section the box is included, and there is a formatting rule on the second to conditionally hide/show the corresponding details for selections made.
If your goal is to bring the data into your main data source you may be better off using something like qRules Insert command with CopyTable in order to copy over the data, and then use similar logic to hide/show or delete entries that are not needed.
Hope that helps!
Bre