Hi,
You van this with using Deduction rule and Counting rule.
First you have to configure counting rule with Quota multiplier "25%" in table "T556C" and after that you need configure Deduction rule in table "V_556R_B" in this table you have to assign that particular absence quota type from which absence quota you want deduct and this duduction rule can be assign in counting rule table.
Regards,
Venkat Polisetty