Yes you can. Usual 90% off your course handicaps and then all play off the lowest handicapper. I'm pretty sure the method is all take 90% off your course handicap and then the lowest receives 0 shots and the rest the full difference between them and him.
Hope that makes sense and if I'm wrong an expert will be along to advise
It also means that players 2, 3 & 4 get shots relative to each other on the same holes as they would if the low man was there.
Eg. Take a group of 4 who get 0, 1, 2 & 3 shots respectively. If all 4 are present, player 4 gets a shot over player 3 on SI 3. If you ignore the low man, then he'd get the shot on SI 2