Main toolbar > Render Scene button > Render Scene dialog > Render Elements panel > Render Elements rollout > Add button >
Render Elements dialog
Rendering menu > Render > Render Scene dialog > Render Elements panel > Render Elements rollout > Add button > Render Elements
dialog
This dialog appears when you click the New button in the Render Elements rollout.

The scrollable list shows the names of elements you can render separately. These are described in Render Elements Panel and Rollout.