When you want to copy and paste multiple layers in Photoshop, you can use the command “copy” and “paste.” The first step is to select the layer you want to copy. Then, press the “c” key and drag the layer across the canvas. The second step is to paste the layer into a new location. To do this, select the layer you want to paste from the Layers palette, then press “v” (or right-click and choose Paste).