Incremental collector

[Steven]

What about this.

The last part can be found from this post. (I sent it to you earlier today in a different post)

Insert Item to end of list at index

Another (less convoluted) OOTB approach… AddLastAtIndex2.dyn (10.9 KB) [AddLastAtIndex2] Design Script version of the above … [AddLastAtIndex2a] a = List.GetItemAtIndex(lst,idx); b = List.AddItemToEnd(itm<1>,a<1>); c = SetDifference(GetKeys(lst),idx); d = List.GetItemAtIndex(lst,c); e = List.Flatten({b,d},1); f = List.Flatten({idx,c},1); g = List.SortByKey(e,f)["sorted list"];