Adding Maps

Hi, I am after some advice. I have an exsiting orchestration that I use to send purchase orders into my back office system , its all done via HTTP posts (without any mapping) and it sends back an acknowlegment for the order, however I now want to add a map for a new order format and order acknowledgment..

Whats the best way to acheive it? I have done the maps but not sure the best way to implement them as I don’t really want to have to copy the existing orch.. I could add the inbound map and presume Biztalk would figure out that it needed to map it due to the schema.. but on the acknowledgment all of the messages are going to be the same.. therefore I’m not sure where to put the maps.. help!

Thanks in advance..