Okay, I get it. You go out to lunch with your fellow workers, sometimes as many as 10-12 and when the check comes you tell the server you all want separate checks. No problem, it can be done. May I suggest ways to make it more efficient all round.
Understand that it takes time. Had the server known from the start she/he could have done the work ahead of time instead of at the end when you are ready to go.
Lunch tabs are usually in the 8 to 12 dollar range. If this is something you do often consider carrying some cash on you. It's fast, easy and cash is always appreciated by the server and the owners.