How do i group 2 lists together

Lists-Logic
1

Hi,
i have 2 Lists, one consists of a List of Ducts, and the Second one consists of their nearest Walls. As you can see in the immage i have 10 ducts and the 10 Walls that are closest to them, which are only 2 different Walls. Now i want to create 2 Lists that group each duct to their Wall so the should look like this:
List 0
Wall 0
Duct 0
Duct 1
Duct 2…4
List 1
Wall 1
Duct 5
Duct 6…9

Any idea how to accomplish that?

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2

GroupByKey is the main piece you’re missing. You’ll have to get some sort of identifier (like ID) to use as your key as I don’t believe it can use elements. You’ll also probably need UniqueItems from your list of Walls to create your new sublists after the Ducts are grouped.

3

yeah that’s what i’ve figured, i got this

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but i don’t know ho to group the walls into the duct lists now

4

Really close. List.Join doesn’t use and lacing or list levels. It’s a straight “combine input lists”. Use AddItemToFront with list levels instead.

5

Worked perfectly thanks so much :smiley: