by Julieanne Kost
To be more efficient when working with multiple layers, you can drag multiple layers into a Layer Group and add a Layer Style or Effect to the group (instead of to each individual layer). But there is a slight difference that you should be aware of. When you add an Effect/Style to a group, Photoshop treats the contents of the group as if they are merged/flattened before adding the Effect/Style. As long as nothing is overlapping, this is not a problem, and the advantages is that if you want to change the Effect/Style, you only have to change the one on the group (not on each individual layer). Of course this might also be the look that you are trying to achieve!
If you do have multiple layers that overlap (and don’t want the effect to appear as if the layers are merged), then you can apply the Effect/Style to one layer and copy/paste it to others. To do this, add the desired Effect/Style. Then, Control -click (Mac) | Right Mouse -click (Win) on the Effect/Style in the Layers panel and choose Copy Layer Style. Then, select all of the other layers and Control -click (Mac) | Right Mouse -click (Win) and paste the effect.