Hi all, I have a problem when setting up solid material for my model. My model is a pcb with two flash light leds on it. I have several extrudes in my pcb component, representing different layers, four layers total. I want to assign copper and FR4 to corresponding extrde.But I can only select the whole PCB component when inserting solid material, I can't select extrude inside pcb component. How can I assign different material to different extrude of one component?

Thanks!