It takes work. You close the store for a day or however long it takes, take an inventory of items, and balance the books, all at that moment in time. That is your starting point for keeping track of what is sold, what is left, and how it compares to your books.
You also need a cash register that makes each salesperson enter their code, and it tallies sales and keeps records.
If you don't have one (they are expensive) then you need NUMBERED sales slips, at the very least.
Warning the staff that you know you are losing inventory and money and are making changes should help, hopefully.
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