Blackrogue
Superstar
I used to be a bartender and foh manager....it can be confusing but if the server is doing their job and there are food and drink runners, it should be easy, especially if more than one server is working the party.
Yeah it's tedious but it's doable. Print the entire receipt. Go down the list asking who had what. And usually if no one's claiming an item they will have to say such and such had it. It's doable. Then I add gratuity automatically. Usually they add the gratuity so the server doesn't get screwed on big parties.