To Assign Element File Names Automatically

1. Assign an output file name and file type for the (entire) rendered scene using the Files button on the Common Parameters rollout of the Render Setup dialog.
2. On the Render Elements rollout, use the Add button to specify elements for rendering.

To render elements to files without rendering the entire scene to a file, follow this procedure and then turn off the scene-wide Save File checkbox in the Common panel Common Parameters rollout Render Output group.