Closing Stock is all physical stock you have on hand in your warehouse not listed on Pick Tickets/Delivery Notes. This can include Available To Sell stock as well as stock required for open Sales Orders
Closing Stock = Opening Stock + Adjustments + Received - Pick Tickets - DNs Shipped - DNs Unshipped
Stock moved to another season will not be visible on Product Stock Inventory list view, it can be viewed by clicking Projected Stock figure and listed as Closing Balance Transfer. For more information on Moving Stock To Another Season
Available stock is physical stock you have on hand in your warehouse that is not required for open Sales Orders
Available = Opening + Adjustments + Received - Sold (+ Closed SO)
Projected Stock is a summary of your future stock position once all stock has been received from Production Orders and all Sales Orders have been fulfilled in full