This List management node will take two lists, and will incrementally take away one list from the other. If you have ListA=1,1,1,1,1 and ListB=1,1,1 and feed them to this node, you should get ListC=1,1. It is used when you want to compare two lists that may have very similar item values. In the example below, it is used to take one single View away from a list of views (notice the different lengths of resulting list).