QuickFile doesn’t have any stock management features so your stock figure wouldn’t change unless you change it manually.
Do you deal with a lot of stock? Generally users use ‘General Purchases’ as the stock category, but if you wish to value and record your stock, these two topics may be of use to you:
http://community.quickfile.co.uk/t/end-of-year-closing-stock-and-opening-stock/4615