Here you have 2 options depending on how you want to see your stocks. If you want to see your stocks in pieces than you most probably are selling your products as you buy them. For example trousers, a beer or a device which you sell without making any modification to it. In this case, at the MU you enter 1, cause you sell it 1:1.

If the stock is needed to make another product, you can follow the quantities after every sale, the losses through entering the total quantity of the stock ( MU- KG/L), for example 0.5 for a pack of coffee 0.5 Kg or 0.7 for a bottle of Rum 0.7 L.

Example:
​a) Bottled beer/ canned beer, water, refreshments(all bottled/canned): For the drinks that you sell 1:1, piece by piece, you will enter "1" and at the measuring unit you will select PC and in the Product recipe you will also add 1 PC. This way, after every sale, 1 Pc from this stock will be deducted.
​
​b)Bottled Vodka, Whiskey, Rum: For the drinks from which you only need a specific amount to produce a cocktail for example, you need to add the quantity of the bottle(MU L or KG) and in the product recipe you have to enter the quantity that is needed to produce the certain cocktail.

More precisely, the Jim beam 0.7 L stock will be registered in the following way:
Products/Raw material - M.U = L
Products/ - Unit Quantity = 0.7
​
For this stock you can create several products. If you sell a glass of jim beam 100 ml, you can create a product Jim Beam 0.1L. In this products recipe you will add the raw material Jim Beam and you will add 0.1 L at the quantity.. This way, after selling one product,from the initial stock you will have -0.1L.