Working with Layers - Adobe Illustrator CS6 on Demand - page 404

sublayers or objects at the same nesting level within the same top-level layer. However,
you can't select multiple sublayers or objects on different top-level layers.
Select Layers
Open a multi-layered document, and then select the Layers panel.
To select a single layer, click the name in the Layers panel.
To select multiple layers in the Layers panel use the following options:
• Contiguous Layers. Click on the first layer, and then Shift+click the last lay-
er to select first, last, and all layers in-between.
• Non-Contiguous Layers. Click on a layer, hold down the Ctrl (Win) or
(Mac) key, and then click on another layer.