We've done various cruises with groups of 4, 6. 8. and 14. We've had to do each night individually. Word of advice, even though you have the same group, same time, and same dining room, do not assume you will get the same table every night. It is logical that you would, but the app throws all logic to the wind. If you want the same table, be sure to see the head waiter, for your section, the first night and let him know that is what is what you expect.