Use the "+ New" button in the top right of inventory to add inventory items. You can add attributes to each inventory item, including lot number, serial number, location, quantity, usage type, cost, and supplier.
Inventory items can have lot numbers, serial numbers, and quantities set. Any inventory item that has serial number cannot have a quantity greater than 1. Serialized parts can have lot numbers, but lot-tracked inventory items need not have a serial number.
ion allows multiple inventory items, with different locations and different tracking attributes (e.g. lot, serial) even amongst the same part number.
ion keeps track of your locations, so you can use the autocomplete to fill in which inventory location an inventory item or items are. You can manage already-created locations in the "Factory" section of ion.
Suppliers work similar to locations. You can use the autocomplete to use an existing supplier or create a new supplier right within the inventory manager.