Set element parameter from containing list

i m trying to write BoundingBox name to all elements inside the bounding box.
If i take an element, how do i get the list above?

like this:

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I mean i want to get the listname of an selected item.

Like this:

I want to write value a to the parameter “Comments” of element b

That basicly was the solution oops…

I didnt know that list levels worked like that… awesome :slight_smile:

It only works for ungrouped items somehow anyone knows a solution to that?