Don't take my word for it as I don't know as same Applied with Soarers, but with the Celsior I know of this and assume Soarer will be Similar.
the only way is to buy a new Key/Transmitter, it comes with it's own little Reciever Unit chip that you put in your receiver unit so they are compatible with each other. It cost me $600. Not sure if you can program different keys to different cars yourself and I've never heard of there being a device that can do it it seems each key comes with it's own chip that you put in the receiver unit.