PDF (adobe.com)

Distribute objects to layers

If you have many objects in a layer, you can avoid clutter in a layer by distributing the objects to new layers. New layers at the same level as the parent layer are created. Also, the newly created layers maintain the hierarchy of layers. Distributing cluttered objects helps you manipulate objects better.
  1. Select the layer with the objects you want to distribute.

  2. Select Commands > Document > Distribute To Layers.