HR TIme management - Defining Halfday absence type

Hi,

I am one problem in SAP HR time mgt.

There are 2 types of absences

"MLFD - Monthly leave full day" and "MLHD- Monthly leave half day"

By applying any of the leaves monthly leave quota type (MLQO) gets deducted.

For MLFD absence type i have given min days as 001 and maximum days as 999.

For MLHD absence type i have given min days as 000 and maximum days as 001.

Working days are defined as 8 hours a day.

User wants when they input MLHD automatically 4 hrs should come and half day monthly leave quota should be deducted.

I want to know is there any indicator as half day for absence types ?

Or

is there any to way to bring the 4hrs automatically ?

Thank Q very much in advance

With regards,

Chandra Sekhar