An analysis case is a template (a set of objects sets) for defining environmental actions on a given system. A Thermal Analysis case consists of a Simulation History, which can contain one or more steps. Each step represents a period of time in the simulation history and is associated with a specific analysis procedure. In the Thermal Analysis workbench you can define the following type of step:

Inserting a New Heat Transfer Step: Generates a Heat Transfer step in a Thermal case. A Heat Transfer step is included by default when you create a Thermal case.