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Mathura,
If you do not know the number of vehicles currently (or historically, with known sales of new vehicles), then you can not know the stock of vehicles in each year out to 2030. This is not a limitation of LEAP - adding a known quantity of sales to an unknown quantity of vehicles still results in an unknown quantity. But perhaps I am not understanding your question clearly.
Have you carefully worked through the pieces of LEAP's online training materials which pertain to transport? Please make sure you're familiar with (specifically) Exercises 2.2 and 5 of this document:
http://www.energycommunity.org/default.asp?action=42
Taylor