Create a dynamic exercise

 Open the "Exercices" tab.
 Click on "Nouveau Sujet" . 
 Select "Exercice dynamique"
 Click on "Créer l'exercice".
 Enter the name of the exercice.
Select the category of the exercice. 
Fill in the number of clear luggage you want within your exercice.
Fill in the number and select the difficulty level of each type of threat you want in your exercice. 
You will see here the suspicious luggage added.
You can remove threat types already added thanks to this button.
Save.