How you can manipulate layers simultaneously in Adobe Photoshop?

Answer 1

One way is to create clipping mask. First create layer with adjustment you want to apply to several layers on top of last layer of group you want to change, then select all layers you want to apply that adjustment by holding Ctrl while clicking layer one by one, then navigate kursor at line when adjustment layer touch layer below (last layer of group you want to change), hold down Alt key and cursor will change to little triangle with two squares behind, then click left mouse button and you will create clipping mask, adjustment layer will affect only previously selected layers.