sharing it again:
create the ear bundle the war moodule in ear,and adjust the ear xmls, as mentioned in the help link as per your provider name and application alias ,make sure there are no build errors in EAR ,test it on your sand box and then move ahead .
you can also provide the new application alias (changes required in NWA as well to reflect the new alias)and in case of any issue after deployment revert to he old one in nwa.