IS there a way to continue to split a list into unique elements

Can someone help with this…
I’m trying to split a list of elements (windows in this case) by unique family names.
I’m showing here a way which is probably not the right way of doing it,
and the problem in this way is that I can’t seem to find a way to loop it.


That and perhaps a List.GroupByKey node?

Can you explain in what way can I define the Key on which to group the sub lists?

I did exactly that when I got the unique types Marked in yellow in my list.
I’m trying to manipulate the different sub lists -
Actually splitting the list into families will do the trick.

Was doing this today for a project. Only counting the string here rather than the elements but still fundamentally the same result.

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