How to achieve functionality in SLA.

Hello All Experts,

I have created SLA for a custom entity and it's working fine.

For Business hours i have predefined Customer Service Schedule.

for Holiday i have predefined the Holiday List.

For Holiday list the default holiday which company provides i have added but one by one,

Now actual scenario:-

1. What if a user take planned leave.

2.what if user takes unplanned leave.

How can i handle this situation, how at runtime  the holidays to be taken into consideration.