It is common in the hotel business to allot rooms to travel agencies or large companies. When a room is allotted to a third party it is not available for sale to anybody else.
It is a little like reserving a room even though you do not know who the client will be. When a block of rooms has been allotted an agent can contact the hotel and make reservations against his allotment.
This means that the agent can sell rooms to his clients, without having to first contact the hotel, in the sure knowledge that the rooms will be available (provided he does not exceed the number of rooms allotted).
HotSoft further refines the allotment process by adding sophisticated release methods that will automatically release allotted rooms based upon rules that you can set.