1- Where to find the function
A- Schedule management section
B- Select Group Calendar
2-Select the right options
A- Select the group
B- Activate the monthly view
C- Determine the member who has absences to modify.
D- Click on absence
3- Choose if you want to add or remove
4- Addition or removal
A- Choose the dates of the addition or withdrawal
B- Remove / add
5- Save (add) or remove the selection