Hi Sriram,
If you want the quota allocated in 2014 to be considered for deduction for any leave being booked in 2015 then there are two ways to do this:
First is that you simply put the "Deduction To" date of quota assigned in IT2006 for year 2014 as 31.12.2015. This will allow the quota of year 2014 to be dedcuted in 2015 as well. However, when you do this make sure that you are setting up the deduction rule appropriately to sort the quotas in ascending order of Deduction From date.
Second way is to transfer the quota balance of previous year into a new carry forward quota type and then use that first for leave booking by giving it priority in your deduction rule.
Hope that answers your query.