Re: Duplicate PCB design
If it's 2 different channels on the same PCB, what you want to do is make the channel design a single lower-level sheet (it can have subsheets). Then on the top level of your schematic, place the lower-level sheet with a REPEAT(LOWER_SHEET_NAME,1,2) designator. This will instantiate 2 copies of the lower-level sheet; the component reference designators can be set to match (R3A,R3B, C5A,C5B, etc). The 2 copies will be placed in separate "rooms" in the PCB layout. You layout 1 of the rooms, then you "copy room format" and the layout will copy to the second channel. This works great, keeps the reference designators matched, and lets you make schematic changes in 1 place, or PCB changes in 1 place and then copy to the other. I should warn you that if you start making changes to ones of the room's layouts after you copy the format (i.e. you run traces in and out differently in each room), then later on if you make a change and want to copy the room format again it might not work as well because of the differences.