Setting up Communication channel to point to specific Application Server

Hi Experts,

We are currently a JAVA single Stack, 7.31 SAP PI shop.

I am currently investigating the possibility of setting up a second Application server to handle specific traffic for a specific Communication channel/ Scenario.

I am having trouble finding a way to point communication channels to a specific App server.

Any ideas on IF this can be done in SAP PI, and if so, How??

Thanks for your time,

Mike