Hey Turbofan, if you check out Honeywell's site they go into the Step Climb differences between their legacy and the new NG systems they have. The MD-11 uses the Honeywell Pegasus FMC (FMS / FCC) which is the legacy variant that used what they called "Optimum Step Climb". Perf Pg 3 is where the crew would set the step climb altitude amount on the legacy models.
An account has to be registered to see the documentation but this is Honeywell's actual FMC Documentation library for all of their FMC's
https://aerospace.honeywell.com/en/learn/services/maintenance-and-service-plans/te