I have the same issue.
Can’t find a way of duplicating a channel or any feasible workaround. Copy/Paste only does bits of the preamp, saving as a library item doesn’t restore any routing or sends or compression as far as i can tell.
I could be missing something but have spent hours faffing without finding a solution. (Even looked at the dat files to see if I could decode and hand edit – not really feasible!)
I also could do with the ability to save libraries of channel types that ALSO save everything but the name.
I think a useful feature would be channel duplicate that does everything apart from the name. (Maybe a PasteALL command?)
I can do this sort of thing easily on a cheapy behringer desk.
Andy