This may be a little OT, but I sure could use some help. I've built a 12x24
multi-use shed, mainly intended to store my hardwood boards and increase
accessibility to those that always seem to be on the bottom. The wood racks
look great. In any case, I'm wiring it for lights, receptacles, exterior
lights and to feed power to a garden pump.

I have a Siemans breaker panel with a 100A main breaker installed. I would
like to have a main breaker handy in the shed. There are two vertical bus
bars which are presently connected by a removable insulated strap that
crosses the midline. One of these vertical bus bars has a green screw that,
if turned, will bond that bar (and the other one too if the strap is left in
place) to the metal case.

The connection to power, which once went to a panel in a mobile home now
replaced by the shed, arrives underground from the meter box (my meter is on
a pole remote from the house and I made the large temp panel there permanent
because the service is split there for several uses) in the form of *four*
insulated #4s: two hot wires, a neutral and a ground. These are controlled
by a 100A 220V breaker at the meter panel.

At the shed, am I supposed to isolate the neutral bus bar (by removing the
strap) and connect my neutrals all there and then ground the case with the
green screw and connect all my grounds to the now separate ground bus bar?
This would replicate the arriving connections and seems right to me, but
what do I know?

Any advice will certainly be appreciated.

Bill