Hi @Nick_Boyts ! , sorry if i’m not so clear maybe my english is not good. . . . allright then, my example is on 2 Roof types, but what if the list grow up to 5 Roof types, so i filtered types between them to get the area of each type, later there’s a “Mat.Sum” node to get a Total Area for each type, this is for “Compare” total Areas between types within the “List Create” node so i can order this list in a “List.SortNatural” node to put the High Value of Areas in the bottom of the list and “Pick it up” with the “Last.LastItem” node. With all this Workflow done, i would like to nest all the elements that are involved in the “Total Area” Picked, so i can put a parameter and its value to make a scheduled of them.