No. Simple convert all quantities to a standard unit when entering them into Finale. For example, suppose you mostly sell individual items. Even if you buy by the case, you can enter your purchase orders as a count of items. When they are received they will increment the open stock level and can be sold without having to track when they are broken apart.
You adopt a convention that your unit for tracking open stock is a display box or even a "case" of product if you mostly deal in full case lots. In this situation, the open stock quantity refers to a count of whatever your company considers the basic unit for the product.