You can access the window by selecting mental ray as your renderer, then selecting the tab, and clicking the New Pass button.
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Select, from the list, the render passes that you want to create. You can multi-select render passes by shift-clicking or
control-clicking.
All render pass presets that you have created are also available from this list.
Name Presets
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Add a prefix or suffix to the render pass names of the passes that you are creating.
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Select the option to create a new pass set. All render passes that you created simultaneously with the render pass set are automatically
associated with the set.
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Click the button to create the selected render passes and close the window. Click the button to keep the window open and create multiple versions of the selected passes.