We use Square for Restaurants (not sure what you are using) - with ours you enter the first item and then swipe it right and a "repeat" button comes up for you to select so it makes it two of those items. If you swipe right again it will multiply by two giving 4 items (not 3).
The way to make it 3 items the same is to enter the first item, then select "Modify" and up the top right of screen a + and - appears to add extra of the same item or remove one of the same item. There is also a number that we can type over if you select it - so when you hit modify, at the top right of screen there is a "+" a "-" and a "1" - we can click on the "1" and type any number over it.
Hope this helps.
