you simply create new ssl_server in your proxylist.
Something like this :
ssl-proxy-list MyList
ssl-server 10 rsakey KEY-A
ssl-server 10 rsacert CERT-A
ssl-server 10 vip address x.x.x.xA
....
ssl-server 20 rsakey KEY-B
ssl-server 20 rsacert CERT-B
ssl-server 20 vip address x.x.x.xB
....
You need a new vip address or a new port for each domain. You can't use the same ip:port for different domain because the decryption process starts before we can determine which domain is contained in the HTTP header.
Gilles.