A separate template is required for each school, regardless of whether time slots are the same.
Only 1 timetable can be checked at a time for conflicts/availability.

Add all likely time slots to the timetable on creation as time slots cannot be inserted at a later stage. (Timeslots can only be added to the end of an existing template).
For example, if an evening time slot is seasonally or occasionally operated, then include it in the template.
The time slot can be marked "inactive" for periods when not required.
If a timetable is used and then found to be incorrect, set as inactive and create a new one.

Class does not check across multiple templates for conflicts/overlaps, ie. Teachers, Rooms and Classes, as each timetable is discreet.
So for example, if a teacher was booked in the same time slot in 2 separate timetables, Class would not warn you of the conflict.

Multiple timetables should be used where separate departments exist, requiring different slot intervals, eg. 1 hour slots instead of 45 minute slots.

A single template is best, where possible.

Create a template for ALL time slots - set the colour for bookable time slots, eg. yellow for AM, blue for PM. (These can be changed later if required).

Add the number of lessons for the slot.
In the above example, 90 minutes covers 2 x 45 minute lessons.

A non-bookable time slot is set to grey:

A typical template would look like this:

Schools  (Maintenance/Settings > Schools > Unavailable)
Set your unavailability dates, eg. public holidays:

Scroll the calendar until a public holiday date appears, then select:
Unavailability Types - select as appropriate, eg. public holiday
Slot update only applies to - select as appropriate, eg. all days
Click the date heading (eg. 26th January) and you will see "Public Holiday" appear in all the time slots for that day.

Individual time slots can be selected as required.
Row (time slot) headings can also be selected.

Unavailability types are created in Maintenance Settings > General Settings > Academic > Unavailable Types (under 'Schools')

If the school is based on Mon-Fri, then update the school timetable as below:

 

Student Timetable Default Note
Use this to record a note which will appear on all student timetables.

Rooms

Set the maximum capacity for each room.
Adjust the code length - timetable ONLY displays the first 4 characters.
Set the room unavailability.
Indicate whether it's a dummy or hired room.
Set the colour - which is useful, but leave blank initially.

Classes

Set a default Payment Unit (if not required, leave as: 1)
Typically, this will be 1, which may represent a lesson or an hour.
Class multiplies the number of lessons assigned to the time slot in the template (eg. 90 minute time slot = 2 lessons) by the "payment unit" above, and reports on this in the Teacher Unit Analysis.

The "value" attributed to this class could be adjusted according to the type of lesson, for example:
If General English = 1.00, then Business English could equal 1.20, ie. 20% more than General English.

Resource Type - leave set = both

Dummy classes can be set up for recording non-"Class" work, eg. marking, preparation time, standby time etc. In this case, set the Resource Type to Timetabling Only.

Teachers

Select the number of pay units per week (hours or lessons).
Set a colour, if you find it useful.

Additional information can be added by double-clicking the cell.
This information "will be in at 12.45" will be available when setting the timetable.

The number of pay units can be set (hours, lessons or slots), indicating the contractual or budgeted weekly units for the teacher.
In the timetable, this is compared and shown with the actual units.

Grade - a 6 character field which shows on the Teacher Unit Analysis report.