Split a Bill Unequally

Not every expense belongs to everyone. Three of you shared a taxi while the rest walked, two people took the room with the balcony, one person did not drink. Splitting the whole trip evenly quietly overcharges somebody every time.

Add the expense, then pick exactly who it is shared with. Everything else stays split across the group as normal, and the final balance accounts for both. Nobody has to argue about the taxi, and nobody has to keep a private tally.