You can, yes. When you create an item to sell in your checkout you can control a few things including: 

Items available: How many you would like to sell in total (e.g. a stock level)
Per order limit: How many can be bought per order
Visible between dates: When you would like your item to be visible in your checkout
Custom expiry dates: Over-ride your account default expiry date when you sell a particular item
Additional terms: Specify some additional usage terms & conditions when you sell a particular item

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