Hi,
It is so simple, just do the following things
1. In the Leave module, add a new Holiday, click 'Next' button, check the checkbox showing in the wizard and click 'Finish' button.
2. Go to Entitlements, select employees and assign that holiday type to employees.
3. Go to leave settings, Check the box 'Enable holiday picker in Employee Self Service'.
4. Go to Administration module, Click ESS rights, Select employee group and enable the holiday picker option.
Then the manager will get a request and he can approve the holiday request.
Regards,
Muneer