You are probably referring to what GSX calls "pushback constraints", so pushback won't start unless the constraints are removed, and they are customized for each support airplane.
In case of the Concorde X, the constraint are that both engine 2 and 3 must be turned on, but they are not a procedure and there's no concept of an specific order of operations; GSX will just remind you to satisfy the conditions still not satisfied, but the order it's not relevant and it's your responsibility.