This is how you can create unique availabilities on Voilà!
Audience: Administrator, Supervisor, Manager, Employee
1. Navigate to the Voilà! web console
2. Click on your profile picture.
3. Click on MY PROFILE.
4. Click on the three dots icon next to Availability. 
5. Select Add unique availabilities.
6. Select the desired date.
7. Click on Add (x) availabilities.
Download as PDF: How to create unique availabilities