forward traffic to multi pools and add x port to original port

You'd use the pool command to forward traffic to a load balanced pool, and the node command to send traffic to a specific IP and port. Your original description sounded like you just needed to add a 1 to the incoming port. If you simply forward traffic to different pools, port translation in the virtual server will change the port to the port of the selected pool member.

Do you just need to send traffic to specific pools, or do you need to send traffic to specific members within pools?