To register the children's holidays just:
- Select the Daily Routines icon
- Select the "Search" option
- Choose the child or Group and the date to mark as holidays
- Select the Entries button (the big one on top of the list of children)
- Choose the reason for the absence "Holidays
- Save
This way you can mark holidays for more than one child at the same time (by selecting the group instead of just one child).