Canon EOS 5D Instruction Manual page 64

A Registering a Picture StyleN
If a Picture Style has already been registered under [User Def. *], changing
the base Picture Style in step 4 will nullify the parameter settings of the
registered Picture Style.
To shoot with the registered Picture Style, follow step 2 on the preceding
page to select [User Def. *] and then shoot.
64
Set the parameter.
6
Turn the <5> dial to adjust the
parameter as desired, then press
<0>.
For details, see "Customizing a
Picture Style" on pages 61-62.
Press the <M> button to register
the new Picture Style. The Picture
Style selection screen will then
reappear.
The base Picture Style will be
indicated on the right of [User Def. *].