1. A system for trading, comprising: a processor configured to: receive an indication to automatically group a set of individual investment instruments related to a same underlying investment instrument held by a user, wherein the individual investment instrument comprises an option contract on the underlying investment instrument; determine a set of possible strategies comprising one or more individual investment legs based on the set of individual investment instruments related to the underlying investment instrument held by the user; determine a set of groupings of strategies from the set of possible strategies comprising combinations of the individual investment instruments that exactly make up holdings of the user related to the underlying investment instrument; and determine one or more selected groupings from the set of groupings of strategies based at least in part on a selection criteria; and a memory coupled to the processor and configured to provide the processor instructions.