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You may set the inventory levels for each product by navigating to the item (Home → Item Management → Items → [select an item]) and then clicking on its Shipping tab of the Item Editor.
Instructions for using that screen are found here.
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UltraCart tracks the inventory allocation by taking the configured quantity in stock, then deducts from the quantity (qty) in stock this way:
- Allocated to SC (Shopping Cart) - This is a temporary allocation to active shopping cart sessions.
- Allocated to PO (Placed Order) - This allocation is to placed orders that have yet to be marked as shipped (reached the "completed" stage
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- Available to Allocate - This represents the QTY in Stock minus the allocated inventory for the SC and PO. This is what is available at the present time.