Now you can create a list of global variables and/or equations. In this example, you will create global variables for the length, width, and thickness of the L-shaped profile that was used to create the feature solid. You also will create an equation to define the height variable of the model. This will be the extrusion distance and you will set it to be half the total of the length plus width. That is, 0.5*(Length+Width). Later, these variables will be assigned to the solid and used to create parameter sets.