www resolve on sub sites

my main site domain.com goes to WWW. domain.com WITH HTACCESS

the sub sites do not have the WWW. added before the domain though.

i went into wp_options for the sub sites and added the www and went in to domain mapping and tried to add http://www.domain.com but the www. gets removed on save.

how can the sub sites have http://www.subsite.com instead of just subsite.com?

thanks much

happy holidays team wpmu!