Comparing each path in a data list

Hey everyone,

I've been searching the forum for an answer two my problem, but I don't seem to find the answer I am looking for. Maybe I am looking in the wrong places.

Anyways, I was hoping that someone would know how to group each data position from each branch ... meaning, for instance, that I have a list of data with 3 branches, each branch containing 28 data instances (see attached image). Now, how would I get the (0;0)+(1;0)+(2;0) to be grouped in a new branch, as well as (0;1)+(1;1)+(2;1) and so on?

Also, I need for the setup to able to take in variables, so that the 3 branches might change to 6, and the 28 data instances might to change to anything between 10 and 100.

Thanks in advance,

/Claus