Note: All pages below are subject to having relevant Roles and Permissions.
Hover on the Modules heading on the Toolbar select Attendance and click on Amend Reason for Change from within the Routines menu.

Choose either Whole School (default) or Class or Student.
Choose the Start Date and End Date using the drop downs to define the weeks required.

Click Search.

Select the Reason for Change to apply and the Students to be updated with that Reason and click Apply.
Click Save.