How to carry forward stock to next financial year

How can I carry forward stock to the next financial year?
as I forgot to enter one last financial purchase and sale. Now I want to enter that data in my system and want remaining stock carry forward to the next financial year.

last financial year purchase = 10 qty
sale = 5 qty

Now I want remaining 5 qty stock carry forward to next financial year.
How can I do that i current financial year?

Thank you…