HR users can define new days that will not count to used days when creating new Vacation Document. Every new created holiday can be defined as one time only or yearly, or in recurring. In case of workdays - days of week week.
You can access this panel as HR User from Navigation Bar Menu ➜ Management (1) ➜ Holidays Holiday Schemes (2). To add a new vacation, please user "Add vacation" button.
Please be advised - users won't be visible here, if they are not being added as members of "Users" of a particular team. For more information please check here.