Suppose I have a list,
list = Table[{n}, {n, 1, 5}]
(*list = {{1},{2},{3},{4},{5}}*)
and I want to remove all values from this list that are greater than 3, so that I get
newlist = {{1}, {2}, {3}}
But the other values should be saved in another list called the drop list to this below as shown
droplist = {{4},{5}}