Canon EOS-1D X Mark III Advanced User's Manual page 563

4.
Select [Connection settings].
5.
Select [SET*].
6.
Select [Create with wizard].
Selecting [Create from list] when multiple communication and function
settings are registered on the camera enables you to combine
registered settings to add new connection settings.
You can also add new connection settings by using connection settings
saved to a card. Configure settings this way by selecting [Load
settings from card] ( ).
563