Because everything in your drawing is associated with a layer, it's likely that in the course of planning and creating a drawing, you'll need to change what you place on a layer or how you view the layers in combination. You can
Reassigning an object to a different layer is useful if you create an object on the wrong layer or decide to change your layer organization. Unless the color or linetype of the object have been set explicitly, an object that you reassign to a different layer will acquire the color and linetype of that layer.
You can change layer properties in the Layer & Linetype dialog box and in the Layer Control. Click the icons to change settings. Layer names and colors can be changed only in the Layer & Linetype dialog box, not the Layer Control. The Layer Control is on the Object Properties toolbar; on the same toolbar, choose Layer to open the Layer & Linetype Properties dialog box.