In the inventory overview "Manage Products", the "In stock" column shows the sum between the quantity of stock that hasn't been allocated to campaigns yet ("What does Available represent" article) and the quantity of stock that has already been allocated to campaigns.
If you are shipping through Octoly, you can think of the "In stock" quantity as the quantity of stock physically present at the Octoly warehouse.
👉 For example: when 20 new units of a determined product arrive at the warehouse, the current number of units of this product present at the warehouse will increase by 20.
Easy right? 😇