Property Manager functions - Tariffs and Rooms
From Jomres v4 manual
Tariffs are extremely important and are linked to rooms (even SRPs) via room/property types. It's vital that you ensure that any tariffs you create in Advanced or Micromanage mode are associated with a room/property type and a corresponding room in your system.
You initially configure how tariffs are edited by editing the settings in the Property Configuration 
-> Tariffs and Currencies tab.
The first option of interest here is very important, and is labelled "Tariff Configuration Mode".
There are three tariff configuration (editing) modes available in this system.
Which you choose to use varies depending on your property type and how you want to charge people.
Once you have set the tariff mode to suite your property you can then go to the the Tariffs & Rooms 
icon to fine tune the Tariffs to suit your requirements.
Tariff Models.
Tariff models for different properties can vary. Some will want to charge a single rate, so whatever the tariff found for a room type is at the beginning of the booking, that rate is applied for the entire period of the booking. This model is known as the Flat Rate model.
The alternative model is the Average model. This is where a corresponding tariff is found for each day of the booking and added to a cumulative sum then divided by the number of days in the booking. It is useful if you want to offer higher prices at weekends or over holiday periods without limiting the length of bookings over said period. If you want to use the Average model then you are advised to switch your Tariff Editing mode (same tab, at the top) to Micromanage. This is because tariff types need to be associated with each other reliably generate the average and if you want to have several different tariffs
