Appending new item in Leave type Drop Down Menu

Hi,

We have deployed ESS 1.0 BP. In leave request application we select the leave request type(PL, CL, SL) from drop down menu.

Here privelige Leave is by default selected... but we need to remove PL from default and add hipen(-) so that user has to compulsory select the leave type from drop Down,

Now the problem is as this list comes from R3 .. so how can we add new item to this drop down menu. Whether its needed to be done R3 side or do i need to modify Leave request Application. If i need to modify this leave request application than h0w can append hipen to the already list coming in drop down menu...

Can any person specify in detail from where this configuration is needed to be done..?

Regards,

Jigar OZa