Change domains for a typo3 (TO)

We have customer with a typo3, [login to view URL] where we want to add 3 more domains to the site [login to view URL] - which is a domain hosted inside that typo3: [login to view URL] [login to view URL] [login to view URL] the last domain should be the main domain for the site, but we keep [login to view URL], the typo3 should also respond to the [login to view URL] versions.