Add Stop/Limit Contingency to Existing Waiting Entry Order

How do I place a Stop/Limit on an existing Entry Order? I can create the Contingency with an OrderList but I need to be able to add/remove them at will (as can be done in the TS application). Do I generate a stopLimitEntry and set the contingency type as is done when creating it within an OrderList? In this case, how is the new entry tied to the primary order? Or is it a stopLimitClose I want to generate to do this? Or is it an OrderReplaceRequest? PLEASE HELP!