The lesson matrix is not just for display purposes; you can enter values into the individual cells. When entering values there is a special dialogue available.
Entering a lesson
Open the Demo2.gpn file and close all windows. Now access the lesson matrix. In the lesson matrix in the figure, classes are displayed in the lines and subjects in the columns.
Class 1a should be allocated 2 periods of Chemistry from teacher Callas.
| 1. | Click on the appropriate cell in the matrix. Please note that a button appears at the right of the cell. Clicking on this button opens the input dialogue. |
| 2. | Now select 2 periods and teacher Callas for the input fields. |
| 3. | A new lesson with lesson number 89 is created. The “L-No/Per” field displays the number of periods entered. |

Caution: Adding a new lesson
You can also create a new lessons by making an entry in a cell with an existing lesson. The process is the same, but the option "Entries in the cell create a new lesson" must be checked in the matrix settings
Modifying a lesson
If you wish to modify an existing lesson the option "Entries in the cell create a new lesson" in the matrix setting must not be checked. In this case, all entries that you make will relate to the current lesson and no new lesson will be created.

Deleting a lesson
Selecting a cell and clicking on the <Delete> button or pressing <Del> removes the entry from the matrix and deletes the lesson.