As we see the item Purchase order we have the option to view the Available Quantity at the selected warehouse also we have one more field called actual quantity at a company which shows the item quantity from across all warehouses please refer to the screenshot from the purchase order item below for your reference

Similarly, we should have this in sales order items and quotation items as well where the person needs to see the total item quantity across all warehouses all at once and if there are any expired items warehouse we can have a check box " do not show Warehouse quantity in available item quantity", which should not show it.

Sales order items and quotation items at present that do not show total item quantity across all warehouses only have actual quantity which shows available quantity in specific warehouses.