OctoTable always takes your needs into consideration, and that is why you can decide how to manage your restaurant.
From your Dashboard go to Configuration > General settings where you can decide whether or not to activate the tab Free manual reservation mode (Ignore configurations for manual bookings).
A) By putting on Yes, manual bookings can be managed without taking into account the configurations made
A couple of examples may be useful for a better understanding:
1) A new reservation can be created in a Hall not associated with the service.
For example, I have two rooms, Indoor Room and Outdoor Room, and I have associated the Indoor Room with the Lunch service.
By activating this option, I can enter a reservation for the Lunch service in the Outer Room even though I have not associated that room with that service.
2) I can fit a 6-person reservation on a 4-person table.
B) By setting the option to NO, the system will enforce the configurations set.
Returning to the example above: if I wanted to make a reservation in a room NOT associated with the service, the system would not show the room in question as bookable.