In LR4 how do I ...
Yes. Can be done with default settings.
See Develop / Set Default Settings ... menu item. But before you do so check your preferences to see if "Make Defaults specific ...." options have been set and adjust these if needed.
Alternative use Alt + Reset in develop to set a default. Use shift + Reset to apply Adobe defaults
Please not that the defaults will only be applied on import or when you clik on reset in develop.
Thank you. That seems to have worked perfectly.