Mcdonald's cash register- should you press Med EVMS for ALL medium meals?

If your registers are the same as ours then yes for combos you need to press the med/lrg option first if u just press the big mac then only a big mac will come up so for an example if some one ordered a medium big mac combo with an extra lrg fries and coke for there drink you would press med then hit big mac then press coke then press lrg then press fries if some one orders just s medium drink or a medium fries then u just have to press that option if they order a large fries or large drinks then you need to press large then the fries etc sorry I hoped this helped a bit confusing writing it down if u need more help jus ask me but u will get the hang of it give ur self 2-3 weeks and you will start to get the hang of it :D I'm a manager at makkas