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Now, while pressing CTRL, click hover over the different layer options until you have identified the surface you wish to select (in this case, a surface on the electronic board); click on that layer. Then, while still holding down CTRL, click the top layer to unselect the top surface. You should now have selected the heat generatRepeat this process for the ten vertical chips and the battery. When you have finished selecting the surfaces, right click, and create a named selection and name it, HeatGeneration