This is a simple example of what i want to do.
I want to add each item at level L1 in the upper list to the corresponding list at level L2 in the bottom list.
i.e: all the items next to the red marks should be added to the list surrounded by the blue box. And all items next to the green marks should be added to the list surrounded by the purple box and so on.
This should result in a new nested list with a new L5.
How can i do this?
Thanks in advance.