When the Quantity Sync feature is enabled, you need to make updates to your quantities in Informed, not on the marketplace. Setting the available quantity to zero on any item will end the listing. The available quantities will be updated for any listing using the same SKU. Inventory updates occur as soon as the available inventory changes in Informed and we'll immediately send the new amount to the marketplace.
Updating quantities per listing
You can enter the quantity for a single SKU on the Listings page when clicking on the edit listing pencil icon.
Updating your quantities in bulk
Your quantities can be updated in bulk from the manage section of your account, select uploads from the side menu and choose the template for "Update Group Inventory".