In the assembly editor, you will add Exterior Insulation to your wall assembly. If the project is Nonresidential Performance, this will be done in the Layers tab by clicking on the Yellow Plus sign to add a layer. Double click on the layer and select an insulation material from the material list, then move it so it is on the exterior of the wall framing.
If the type of project is Prescriptive, then edit the JA4 tab and simply type in the R-Value of the insulation in the Exterior Insulation entry. If the project is a Residential Title 24 Performance project, enter the Exterior Insulation on the Res T24 Performance tab.
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