In your example you will have a total available amount of 2000 + 5000 = 7000 that can be deducted for 2014. This is all good because your 2014 deduction limit is 10000.
Now, it is optional whether you choose to deduct all, some or none of the 7000.
On both the paper form and in Turbotax RRSP tab you will see you are asked to designate an actual amount, which could to be the full 7000 available, leaving no unused for 2015, which is perfectly ok.
Don't worry, there is no penalty and no problem with leaving amounts undeducted, and you can only deduct them once.
