P3 to P4

I am a ProfiLux 3.1 T EX user, and want to upgrade to your new ProfiLux 4, but the pronlem is how to run the P3 and P4 togther in the same system? Is it possible to set the system to make the new P4 as the main, and the old P3 as the extension box, at least, I don't need to throw the P3 away.
Or it there any suggestion to combine the P4 and P3?

Thanks, and waiting for your reply.
Kelvin soong

Hi

no, a ProfiLux controller can't be used as a slave device in a system