If your talking about the pit in spec ops then it also doesnt matter as the ingame timer of completed run only matters, but idk if the method of forcesave works in specops

every run you have to forcesave and run through it, once you find your desirable setup, you just load it and there you go, (look for some tutorial how to bind save and load), the save actually stays forever until you play some other mission to the checkpoint, after the break from ssdd run you must load the ssdd as a 'choose mission" and then press the binded key to load the saved setup, thats how it works for me, unless you both play on ps or xbox this should work for you too