To Nest Layers within Layers
Use the Layer Properties dialog box or copy and paste commands to nest layers within layers.
1. In the Layer Tree, right-click the layer name. The shortcut menu appears.
2. Click Layer Properties. The Layer Properties dialog box opens. The Include button is selected by default.
3. Select the layer to nest from the Layer Tree. This layer name appears in the Contents list. However, items of the nested layer are not listed.
To show items of nested layers in the layer tree, click and then click Items on Nested Layers.
Alternatively, you can use copy and paste commands to nest layers.