Create a pool of virtual servers

Are you actually wanting two identical copies of the connection to send each one to two different VS's? Or do you have a connection being processed by VIP A and you want to perform some logic on the connection on VIP A and if it meets a certain condition then have VIP A send the connection to VIP B to handle?

If the latter, then you can use a node statement in the irule of VIP A

...some logic
if { $LOGIC eq "1" } {
   node IP_VIPB PORT_FOR_VIPB
} else {
   return
}

If the former, then you are basically limited to connection cloning and/or sideband connections