In the Zimbra Web Client, click the Documents tab.
Right-click
on the Notebooks bar, select New Notebook.

The Create New Notebook dialog displays. Type the name for the new notebook.
This name must be unique within the hierarchy of your mailbox folders. Notebooks created under the Notebooks bar cannot have the same name as any top-level folder in your Zimbra mail, calendar, or address book. For example, if you have a calendar named Holidays, you cannot name a top-level notebook Holidays. Holidays could be a name of a notebook within another notebook.
Click on the folder hierarchy to place the new notebook folder. You can create a new top-level notebook, or you can place it under an existing notebook.
Click OK. The new notebook displays in the Overview pane.