Record stock-in and stock-out
Keep your quantities accurate with movements.
Every change to a quantity is a stock movement, so you always have an audit trail.
Stock-in: record goods arriving from a supplier. You can enter by pieces or by carton/pack and the total pieces are worked out for you.
Stock-out: sales deduct stock automatically. You can also record manual stock-out for damage or internal use.
Stock can never go negative — the system blocks an over-sale.