Use the layers to control the visibility of individual objects.
Click Add Layer in the Layer palette to create a new layer.
Double click on the name to rename the layer.
To add objects to the layer, select one or more objects in the scene and then choose the desired layer from the Selection on drop down list.
To turn the layer visibility off, click the left checkbox under the eye icon.
To lock a layer so that objects on the layer can't be selected, moved, or edited accidentally, click on the right checkbox under the padlock icon.
To select all object(s) on the layer, click the selection icon next to the layer name.
To delete a layer, click the trash icon next to the layer name. Only the layer, not the objects assigned to the layer, will be deleted.