Option to create leave requests in bulk is only available for admin users.
In order to do it  press New absence button and select Import Leaves option there.
New absence form with blue arrow pointing to Import Leaves link
Then on Leaves import screen download sample file as an example to fill.
Screenshot of Leaves import page
Once file is complete with all the data please select File - Export to - CSV and save a document as a CSV file.
Screenshot of File menu how to save CSV document
Once it is done return to Leave import page. Select data format used in file and upload a file using Choose file button. Then press Import Leave data button.
Screenshot of Leaves import page with Date format selector
Final screen will show message that all leaves requested in the file are successfully added. Now they will be visible as approved leaves in Team View.
Leaves import page with success message after downloading