Stock Management / Inventory Management
The process of tracking what items you hold, where they are listed, their purchase cost, and their listing status. At small scale, a spreadsheet per category works well. At 100+ active listings, dedicated inventory management software (Linnworks, Sellbrite, or the inventory features in crosslisting tools) prevents double-selling and simplifies EOFY cost-of-goods calculations. Stock management also involves physically organising your inventory so items can be found and dispatched quickly.
Where you'll see this
This term is commonly used on:
ebaydepopshopify
Put this into practice
Shopfront handles the hard parts of crosslisting and inventory sync so you can focus on finding and selling.