You carry soft drinks in two places: cans in vending machines, and as fountain drinks in cups at refreshment stands. The format of the drinks determines where the drinks will be placed (layout):

If you want to start carrying a new cola drink. If the drink is to be served only at refreshment stands, then you assign the drink to the layout module for drinks at refreshment stands. Stores that have only vending machines and no refreshment stands will not carry the drink.