Mass addition by number's index

Hi all,

I wanted to create a new tree data of the attached image by item index. In another word, I want the new tree data would be a tree by nine branches which each branch take care of one index; the first branch is made from three numbers with index zero of the image, the second branch is made from three numbers with index 1, and so on. Would be great if anyone could help me.

Thanks

Try List>Tree>Flip Matrix. If you want to sum the three items in each resulting branch, then you can use Mass Addition.

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It worked
Thanks