To adjust the stock of a certain product in your Vetocare, press "Mutation" if you are in a product page.
You will now see a window where you must enter a number of things:
Mutation The amount by which the stock of the product will decrease / increase.
Increase / decrease Here you select whether the quantity that you have entered previously is an increase or decrease of the current stock. If you buy, you speak of an increase, if you have sold you speak of a decrease.
Current / new stock Here you can see what the current stock is and what the new stock will be from the moment this mutation is applied to the current product stock.
Reason The reason for the mutation. Such as "Purchasing" or "Theft".
Then you just have to press "Save" to apply the mutation.