Nikon D6 Reference Manual page 805

Renaming Photo Shooting Menu Banks
A descriptive caption can be added to the bank name ("A", "B",
"C", or "D") by highlighting the bank and pressing 2 . Captions
can be up to 20 characters long.
Restoring Default Settings
You can restore default settings for a selected photo shooting
menu bank. To do so, highlight the bank and press O ( Q ); a
confirmation dialog will be displayed. Highlight [Yes] and press
J to restore default settings for the selected bank.
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Photo shooting menu reset is not available while a multiple
exposure is in progress.
C The Photo Shooting Menu: Shooting Options 753