Kod:
Options +FollowSymLinks
Options +SymlinksIfOwnerMatch
RewriteEngine on
RewriteCond %{HTTP_HOST} ^subdomain.website.com$ [OR]
RewriteCond %{HTTP_HOST} ^www.subdomain.website.com$
RewriteRule ^(.*)$ http://www.website.com/~subdomain/ [R=301,L]
ayrıca apache dökümantasyonundan Rewrite modülüne bakabilirsiniz.