Removing cookie from specific set of IP pool and allow for other.

Put the IP addresses for the pools in a datagroup and remove the cookie if it exists in HTTP_RESPONSE:

when HTTP_RESPONSE {
    if {[class match [IP::server_addr] equals pool_datagroup]} {
        if {[HTTP::cookie exists "myCookie"]} {
            HTTP::cookie remove "myCookie"
        }    
    }
}