Clerk can register bookings for multiple rooms simultaneously on behalf of one client (person/company/agency) - just "click" manually on the dashboard the number of rooms that you want to book at the same time.
The booked rooms are registered under the same person/company/agency, but the accounts are settled separately by room. This will allow you to make changes if desired on rates and also have a bill for each room.
Starting from there, each room reservation will be managed independently but still be related to the others. Thus to maintain order between the reservations payed by a person, company or agency.
*Remember that an account belongs to one "client" (the one who pays on the "billing" tab) for each account you can register as much as it is possible of passengers (Mr., Mrs., son ...)