If the HB is of the two wire variety, it would be wired in just the same as the SCs. If they are of the 4-wire variety, there are numerous options, but they can be wired just like a 2-wire one by wiring the 2 coils in series (what goes where to do so depends on your pickup color coding).
BTW, to get phasing for any pickup, you only actually need phase switches on two of them, since putting those two 'out of phase' would in fact put the third pickup out of phase with the other two.
E.G, with phase switches on the neck and bridge, reversing both would put them in phase with each other, and the middle one out of phase. Doesn't hurt to have one for each though, and it makes the guitar look a bit neater.