Tables, stewards and the floor
The table belongs to somebody. Steward-wise sales are answerable because the captain on the table is a fact, not the login on the till.
One terminal at the pass is used by every captain on the floor, so the login on a bill says which till took it, not who served the table. The POS records both.
Tables and sections
An outlet's tables are laid out in sections — the terrace, the main hall, the private room — and each shows its state: free, seated, ordered, billed. Covers are counted at seating.
The captain
A table is given to a captain when it is seated. Every KOT and bill on that table carries the captain, so steward-wise sales and the service charge are answerable to a name. Moving a party moves the captain with it unless the floor says otherwise.
Split and merge
One bill becomes two when a table asks to pay separately; two tables become one when a party grows. Both are billing moves with the KOTs preserved, so the kitchen's record and the floor's record agree.