On Quantity page, you can enter a Purchase Order. If the date of the Purchase Order is today or earlier, the quantities entered will automatically be counted in Teapplix 'Current Quantity' page and will be used to sync to marketplace or channels.
If the date of the Purchase Order is in the future, the quantity will start applying to current quantities on and after that date.
On our "Current Quantities" page, you can optionally turn on a 'Future Quantity' column. All quantities that are on 'future dated' purchase orders will be added to that column for a particular SKU.