Addition of 2 trees

I have 2 data-trees and would like to add the corresponding items together and make a new data-tree. 2 lists are of same length and have around 8000 data. I would like to

  1. remove the first 8 items in the data tree before doing the addition
  2. adding the items of two data-trees accordingly, i.e. add item 1 of tree 1 to item 1 of tree 2

May I ask if there is any way to do this?

Thanks a lot in advance.

1 you can do with the shift component (set wrap to false)

2 you can do with the addition component

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