In the Company Settings option on the left menu, you will find the Public Holidays settings. 

By default, Singapore standard holidays is the selected Public Holiday Group with all Public Holidays created. 

You can add another Public Holiday Group by clicking on the + button.

Select the country and give the Group a name. None of the Public Holidays will be populated, so you will need to create them by clicking on Add new Holiday. 

You can apply the Public Holiday Group as a default for all employees or to selected employees.

Once you've created a new Public Holiday Group, you can choose to apply it to ALL Employees by changing the Default Public Holiday Group Settings under Other Settings. 

Note: This will only apply to employees who are under the default settings (i.e. their Public Holiday Group has not been changed individually). 

If you wish to only apply this Work Week to particular employees, you can go to their individual profiles to change their settings.

Go to My Employees > Employment and under Working Hours And Public Holidays edit the Public Holiday Group applied.

 Select the Public Holiday group you wish to assign to the employee and click Save.