Gateway Failover - Block of VIPs

[afrojoe]

Hello Everyone,

I have a pfSense setup and working just dandy. (see attached)

-All block ranges of IPs have been configured in pfSense as VIPs
-DynDNS has been configured for a specific subdomain (subdomain.xyz.com) to failover from WAN1 to WAN2 and works just fine (subdomain.xyz.com on WAN1 Interface IP fails over to subdomain.xyz.com on WAN2 Interface IP)

Now we come to what I would like to do!  ;)

How can I configure pfSense to failover only subdomain.xyz.com to one of the WAN2 VIPs? (and let ALL the remaining subdomains *.xyz.com to go out on WAN2 Interface IP?)