Restrict Absence reasons

Summary:

Restricting Absence Reason to be visible on Absence recording page based on Business Unit.

We have 5 BUs and same Absence type is applicable to all the BUs. These BU's have separate rules for validation. For eg. with a combination Absence Reason and BUs the duration for 4 BUs is 4 days for for 5th BU, the duration is 2 day. This is handled via validation fast formula.

The requirement that we are looking to achieve is that if the Absence reason 'X' is only applicable to BU no. 3, it should only be visible to that set of Employees.

Creating a separate Absence type is one of the option but is there any other way to handle this ? We need to restrict the Absence reasons to be part of the look up or not during the Absence recording. So basically defining a eligibility for Absence reasons.