Answered my own question...
Example below added to customise page code in the GA tool:
var gaProperty //store the property if(location.host == ("xxx")) { gaProperty = 'UA-1234567-1'; } else if (location.host == ("xxx")){ gaProperty= 'UA-1234567-1'; } else { gaProperty= 'UA-1234567-1'; } _gaq.push(['_setAccount', gaProperty]);