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BUS bars do not specifically have to be a BUS bar.
For example, with my 4 marine switchable breakers I mentioned above, I do not have 4 wires going to the 4 breakers.
I have a 2 AWG wire going to the first one (80 amp) then they are daisy chained.
The picture below is an early version of what I eventually ended up with, but gives you an idea
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