You can create additional calendars as well:

1. Select “New Calendar” from the panel on the left of the Zimbra Calendar window and give it a name.
2. You can choose a color for the calendar to distinguish its appointments from your other calendar’s.
3. If the appointments on this calendar will not be affecting your free/busy time, check the box to exclude them from it.
4. If you would like the events on this calendar to be synchronized with a remote calendar, you can enter the URL.