You need to program it first
Plug the second power bar 110V line into wall socket
Unplug first power bar from S1-S4 and plug in the new power bar.
Go to the ProfiLux control software and go to power socket menu, and select digital power bar numbering, then follow instructions. You will want to number it 7-12.
Once programmed unplug new power bar from S1-S4 and plug back in the original one.
Then plug new power bar into second western socket on power bar (daisy chain)
This is all written in the manual for you to refer to