I’m working on using Dynamo to place revit files from an excel document. I’ve had success importing all the correct information, and now I’m trying to group items based on their sublist information.
Each sublist value from the ‘List.GetItemAtIndex’ node represents the width of each different family. They are grouped in their sublists based on their “department” which was specified in the excel document.
I am able to place them based on their width (x-direction) using the code block ‘Geometry.Point.ByCoordinates’, and am now trying to split them, based on their “department” and array them in the y direction, such that sublist  (List.GetItemAtIndex) would have y-value from ‘List.Maximum’, sublist would have y-value and so on.
I have pulled as much information I can from here: http://dynamobim.com/forums/topic/placing-multiple-families-using-an-excel-document/ A post that is trying to achieve something similar (special thanks to Dimitar Venkov for his Python Script) but keep getting stuck.